Reheat is a 6 output heater board with temperature sensors and fans for multi material printing.
<div class="res-img">
[[File:Reheat A0.png]]
</div>

==Schematics==
* [https://github.com/intelligent-agent/Recore/blob/master/Schematics/Reheat_A0.pdf Reheat A0 Schematics (PDF)]

==Features==
* RP2354B microcontroller (ARM Cortex-M33, 150 MHz)
* 6x heater outputs (24 V, MOSFET-switched)
* 6x fan outputs (24 V PWM) with tachometer inputs
* 6x thermistor/temperature sensor inputs
** Supports: NTC 10K, NTC 100K, PT100, PT1000, Type K thermocouple
** Jumper-selectable per channel
* 12x endstop inputs (5 V tolerant, TVS-protected)
** ENDSTOP-12 supports a bidirectional signal (e.g. filament encoder)
* USB-C interface (USB 2.0)
* 24 V power input with onboard 5 V (3 A) and 3.3 V regulation
* Overcurrent detection on fan bus

==Pinout==

{| class="wikitable"
|-
! GPIO !! Signal !! Connector
|-
| GPIO0 || HEATER-1 || J2
|-
| GPIO1 || HEATER-2 || J3
|-
| GPIO2 || HEATER-3 || J6
|-
| GPIO3 || HEATER-4 || J11
|-
| GPIO4 || HEATER-5 || J12
|-
| GPIO5 || HEATER-6 || J13
|-
| GPIO6 || FAN-1 || J34
|-
| GPIO7 || FAN-2 || J35
|-
| GPIO8 || FAN-3 || J36
|-
| GPIO9 || FAN-4 || J37
|-
| GPIO10 || FAN-5 || J38
|-
| GPIO11 || FAN-6 || J39
|-
| GPIO12 || TACH-1 || J34
|-
| GPIO13 || TACH-2 || J35
|-
| GPIO14 || TACH-3 || J36
|-
| GPIO15 || TACH-4 || J37
|-
| GPIO16 || TACH-5 || J38
|-
| GPIO17 || TACH-6 || J39
|-
| GPIO18 || ENDSTOP-1 || J14
|-
| GPIO19 || ENDSTOP-2 || J15
|-
| GPIO20 || ENDSTOP-3 || J16
|-
| GPIO21 || ENDSTOP-4 || J17
|-
| GPIO22 || ENDSTOP-5 || J18
|-
| GPIO23 || ENDSTOP-6 || J19
|-
| GPIO24 || ENDSTOP-7 || J20
|-
| GPIO25 || ENDSTOP-8 || J21
|-
| GPIO26 || ENDSTOP-9 || J22
|-
| GPIO27 || ENDSTOP-10 || J23
|-
| GPIO28 || ENDSTOP-11 || J24
|-
| GPIO29 || ENDSTOP-12 || J25
|-
| GPIO30 || MUX-S0 || Internal
|-
| GPIO31 || MUX-S1 || Internal
|-
| GPIO32 || MUX-S2 || Internal
|-
| GPIO33 || PWM-GAIN || Internal
|-
| GPIO34 || PWM-OFFSET || Internal
|-
| GPIO35 || PWM-CURRENT || Internal
|-
| GPIO36 || EN-PULLUP || Internal
|-
| GPIO37 || ENDSTOP-12-DIR || J25
|-
| GPIO38 || FAN-OC (overcurrent) || Internal
|-
| GPIO40 / ADC0 || THERM-1 || J27
|-
| GPIO41 / ADC1 || THERM-2 || J28
|-
| GPIO42 / ADC2 || THERM-3 || J29
|-
| GPIO43 / ADC3 || THERM-4 || J30
|-
| GPIO44 / ADC4 || THERM-5 || J31
|-
| GPIO45 / ADC5 || THERM-6 || J32
|-
| GPIO46 / ADC6 || ADC (MUX output) || Internal
|-
| GPIO47 / ADC7 || CURRENT sense || Internal
|}

==Hardware connections==

===Power===
The board takes 24 V DC on a 4-pin connector (J33). A fuse (F1) and a 2 mΩ current-sense resistor (R98) protect the input. Onboard regulators provide +5 V (TPS54302 buck converter, 3 A) and +3.3 V (AMS1117-3.3, 1 A) for logic and sensor pull-ups.

===Heaters===
Six heater outputs use 2SK3019 N-channel MOSFETs driven from GPIO0–GPIO5. Each output has a 2-pin female connector and a flyback Schottky diode. The heater voltage is 24 V.

===Fans===
Six fan outputs (GPIO6–GPIO11) use N-channel MOSFETs with a 24 V supply. Each has a 3-pin connector (V+, GND, TACH). Tachometer signals are read on GPIO12–GPIO17. An LM393 comparator monitors the fan bus for overcurrent and signals FAN-OC on GPIO38.

===Thermistors===
Each thermistor channel has a 3-pin connector (J27–J32) with a jumper (JP1–JP6) to select the measurement mode. An analog MUX (CD4051) and op-amp signal conditioning chain feed the ADC inputs (GPIO40–GPIO45). The signal conditioning supports:

{| class="wikitable"
|-
! Sensor type !! Measurement method
|-
| NTC 10K || Voltage divider with 4.7 K pull-up
|-
| NTC 100K || Voltage divider with 4.7 K pull-up
|-
| PT100 || 1 mA constant current source (Kelvin connection)
|-
| PT1000 || 1 mA constant current source (Kelvin connection)
|-
| Type K thermocouple || ×101 gain amplifier, buffered
|}

For NTC thermistor or PT1000 measurements, close jumpers JP1–JP6 to connect the 4.7 K pull-up resistors. With the jumpers closed, ADC0–ADC5 (GPIO40–GPIO45) can be used as standard thermistor inputs with a 4.7 K pull-up to 3.3 V, without the need for any additional signal conditioning.

==Errata==
# DP/DM USB data lines are swapped.
# RUN pin is hardwired to ground, preventing software reset.
# U11 and U15 (LMV321 op-amps in thermistor circuit) have V+ and V- supply pins reversed.
# Pull-up resistor footprints (JP1–JP6) use a 1 mm pin pitch instead of the standard 2.54 mm.
# VUSB is unconnected, so the board requires 24 V power to operate even when connected over USB.

==Klipper configuration==

The Reheat A0 connects to the host over USB and is configured as an MCU in Klipper. Find the serial path with <code>ls /dev/serial/by-id/</code> and add to <code>printer.cfg</code>:

<pre>
[mcu reheat]
serial: /dev/serial/by-id/usb-Klipper_rp2350_XXXXXXXXXXXX-if00
</pre>

===Heaters===
<pre>
[heater_generic heater1]
heater_pin: reheat:gpio0
sensor_type: NTC 100K MGB18-104F39050L32
sensor_pin: reheat:gpio40
control: pid
pid_Kp: 22
pid_Ki: 1.08
pid_Kd: 114

[heater_generic heater2]
heater_pin: reheat:gpio1
sensor_type: NTC 100K MGB18-104F39050L32
sensor_pin: reheat:gpio41
control: pid
pid_Kp: 22
pid_Ki: 1.08
pid_Kd: 114
</pre>

===Fans===
<pre>
[fan_generic fan1]
pin: reheat:gpio6

[fan_generic fan2]
pin: reheat:gpio7
</pre>

===Endstops===
Endstop pins can be referenced in the relevant stepper sections:
<pre>
[stepper_x]
endstop_pin: reheat:gpio18
</pre>

==Flashing Klipper==

# Put the board in BOOTSEL mode: hold the BOOT button while plugging in USB (or hold BOOT, press RESET, then release BOOT).
# Build and flash from the Klipper source directory:
<pre>
make menuconfig
# Processor model: rp2350
# Bootloader offset: No bootloader
# Communication interface: USBSERIAL
make
picotool load out/klipper.uf2 --force
picotool reboot
</pre>
The board will reboot and appear as <code>/dev/ttyACM0</code> (or similar).

==Full config file==
<pre>
# ======================================================================
# Reheat_A0.cfg — Complete Klipper configuration for the Reheat A0
# MCU: RP2354B (RP2350 family, ARM Cortex-M33, 150 MHz, 48 GPIO, 8 ADC)
# Source: https://wiki.iagent.no/wiki/Reheat_A0
#
# Board functions:
# 6x heater outputs (24V MOSFET) GPIO0..GPIO5
# 6x fan outputs (24V PWM) GPIO6..GPIO11
# 6x fan tachometer inputs GPIO12..GPIO17
# 12x endstop inputs (5V tolerant) GPIO18..GPIO29 (+ GPIO37 dir)
# 6x thermistor/temperature ADC inputs GPIO40..GPIO45 (ADC0..ADC5)
# analog mux + PWM bias control GPIO30..GPIO35
# endstop pull-up enable GPIO36
# fan over-current flag GPIO38
# ADC mux output / input-current sense GPIO46/GPIO47 (ADC6/ADC7)
#
# Each fan is paired with its matching heater (FAN1<->HEATER1, ...).
#
# Build firmware: RP2350 (ARM) processor, USB communication.
# Flash: hold BOOT while plugging in USB-C to enter BOOTSEL.
# ERRATA: RUN pin is hardwired -> Klipper cannot software-reset the MCU
# (re-enter BOOTSEL manually to reflash). USB DP/DM are swapped.
# ======================================================================

# ----------------------------------------------------------------------
# MCU
# ----------------------------------------------------------------------
[mcu reheat]
# USB-C, enumerates over USB. Use the stable by-id path:
# ls /dev/serial/by-id/*
serial: /dev/serial/by-id/usb-Klipper_rp2350_21745F8FD0431B3A-if00
restart_method: command

# ----------------------------------------------------------------------
# Endstop pull-up enable (GPIO36)
# Drive high at boot so the 12 endstop inputs read correctly.
# ----------------------------------------------------------------------
[static_digital_output endstop_pullup_enable]
pins: reheat:gpio36

# ======================================================================
# HEATERS (24V MOSFET outputs, paired with ADC thermistors)
# Sensor types supported by the board: NTC 10K, NTC 100K, PT100,
# PT1000, Type-K thermocouple. NTC 100K -> "Generic 3950".
# Pairing of heater<->thermistor is arbitrary; reassign as needed.
# ======================================================================

[heater_generic heater1] # HEATER1 / THERM1
heater_pin: reheat:gpio0
sensor_pin: reheat:gpio40 # ADC0
sensor_type: EPCOS 100K B57560G104F
control: pid
pid_Kp: 22
pid_Ki: 1.08
pid_Kd: 114
min_temp: -272
max_temp: 300

[heater_generic heater2] # HEATER2 / THERM2
heater_pin: reheat:gpio1
sensor_pin: reheat:gpio41 # ADC1
sensor_type: EPCOS 100K B57560G104F
control: pid
pid_Kp: 22
pid_Ki: 1.08
pid_Kd: 114
min_temp: -272
max_temp: 300

[heater_generic heater3] # HEATER3 / THERM3
heater_pin: reheat:gpio2
sensor_pin: reheat:gpio42 # ADC2
sensor_type: EPCOS 100K B57560G104F
control: watermark
min_temp: -272
max_temp: 300

[heater_generic heater4] # HEATER4 / THERM4
heater_pin: reheat:gpio3
sensor_pin: reheat:gpio43 # ADC3
sensor_type: EPCOS 100K B57560G104F
control: watermark
min_temp: -272
max_temp: 300

[heater_generic heater5] # HEATER5 / THERM5
heater_pin: reheat:gpio4
sensor_pin: reheat:gpio44 # ADC4
sensor_type: EPCOS 100K B57560G104F
control: watermark
min_temp: -272
max_temp: 300

[heater_generic heater6] # HEATER6 / THERM6
heater_pin: reheat:gpio5
sensor_pin: reheat:gpio45 # ADC5
sensor_type: EPCOS 100K B57560G104F
control: watermark
min_temp: -272
max_temp: 300

# ======================================================================
# FANS (24V PWM)
# Each fan follows its matching heater (FAN1<->HEATER1, FAN2<->HEATER2,
# ... FAN6<->HEATER6) and turns on when that heater is active.
# ======================================================================

[heater_fan fan1] # FAN1 -> HEATER1
pin: reheat:gpio6
heater: heater1
heater_temp: 50.0

[heater_fan fan2] # FAN2 -> HEATER2
pin: reheat:gpio7
heater: heater2
heater_temp: 50.0

[heater_fan fan3] # FAN3 -> HEATER3
pin: reheat:gpio8
heater: heater3
heater_temp: 50.0

[heater_fan fan4] # FAN4 -> HEATER4
pin: reheat:gpio9
heater: heater4
heater_temp: 50.0

[heater_fan fan5] # FAN5 -> HEATER5
pin: reheat:gpio10
heater: heater5
heater_temp: 50.0

[heater_fan fan6] # FAN6 -> HEATER6
pin: reheat:gpio11
heater: heater6
heater_temp: 50.0

# ======================================================================
# ENDSTOPS (11 inputs, 5V tolerant) + NeoPixel on EP12
# This board has no stepper drivers, so endstops are exposed as
# runtime-readable buttons. To use one as a homing endstop instead,
# reference its pin from a stepper on your motion board, e.g.:
# [stepper_x]
# endstop_pin: reheat:gpio18
# Endstop 12 (GPIO29) is wired to a NeoPixel data line (see below).
# ======================================================================

# Each endstop is exposed as a button so its state is queryable. The
# press/release gcode is intentionally empty (just reads the input).
[gcode_button endstop1]
pin: reheat:gpio18
press_gcode:
release_gcode:

[gcode_button endstop2]
pin: reheat:gpio19
press_gcode:
release_gcode:

[gcode_button endstop3]
pin: reheat:gpio20
press_gcode:
release_gcode:

[gcode_button endstop4]
pin: reheat:gpio21
press_gcode:
release_gcode:

[gcode_button endstop5]
pin: reheat:gpio22
press_gcode:
release_gcode:

[gcode_button endstop6]
pin: reheat:gpio23
press_gcode:
release_gcode:

[gcode_button endstop7]
pin: reheat:gpio24
press_gcode:
release_gcode:

[gcode_button endstop8]
pin: reheat:gpio25
press_gcode:
release_gcode:

[gcode_button endstop9]
pin: reheat:gpio26
press_gcode:
release_gcode:

[gcode_button endstop10]
pin: reheat:gpio27
press_gcode:
release_gcode:

[gcode_button endstop11]
pin: reheat:gpio28
press_gcode:
release_gcode:

# NeoPixel on the EP12 connector (GPIO29 data line).
[neopixel reheat_led]
pin: reheat:gpio29
chain_count: 1
color_order: GRB
initial_RED: 0.0
initial_GREEN: 0.0
initial_BLUE: 0.0

# EP12 direction line (GPIO37) — drive the level-shifter towards the
# NeoPixel (output direction).
[static_digital_output endstop12_dir]
pins: reheat:gpio37

# ======================================================================
# ANALOG MUX + PWM BIAS (board-internal sensor front-end)
# MUX_S0..S2 select one of the multiplexed analog channels, read back
# on ADC_MUX (GPIO46/ADC6). PWM_GAIN/OFFSET/CURRENT set the analog
# amplifier bias used for PT100/thermocouple measurement.
# These are exposed as raw pins; exact scaling is board-specific.
# ======================================================================

[output_pin mux_s0]
pin: reheat:gpio30

[output_pin mux_s1]
pin: reheat:gpio31

[output_pin mux_s2]
pin: reheat:gpio32

[output_pin pwm_gain]
pin: reheat:gpio33
pwm: True
cycle_time: 0.001
value: 0

[output_pin pwm_offset]
pin: reheat:gpio34
pwm: True
cycle_time: 0.001
value: 0

[output_pin pwm_current]
pin: reheat:gpio35
pwm: True
cycle_time: 0.001
value: 0

# ======================================================================
# PROTECTION / MONITORING
# ======================================================================

# Fan over-current flag (GPIO38) — reads active on an over-current event.
[gcode_button fan_overcurrent]
pin: reheat:gpio38
press_gcode:
release_gcode:

# Input-current sense (GPIO47 / ADC7) via the 2 mΩ shunt.
# Scale: 1 A = 0.1 V -> 3.3 V full-scale = 33 A. The reported
# "temperature" value is therefore the input current in amps.
[adc_temperature reheat_current]
temperature1: 0
voltage1: 0
temperature2: 33
voltage2: 3.3

[temperature_sensor input_current]
adc_voltage: 3.3
sensor_pin: reheat:gpio47
sensor_type: reheat_current
min_temp: -1
max_temp: 40

</pre>

[[Category:Hardware]]

==Errata==
# DP/DM USB data lines are swapped.
# RUN pin is hardwired to ground, preventing software reset.
# U11 and U15 (LMV321 op-amps in thermistor circuit) have V+ and V- supply pins reversed.
# Pull-up resistor footprints (JP1–JP6) use a 1 mm pin pitch instead of the standard 2.54 mm.

Reheat A0

2026-05-16T18:00:34Z

Elias: Add VUSB errata

Reheat A0

2026-05-16T17:59:09Z

Elias: Add JP1-6 pull-up note to thermistors section; add 1 mm pitch errata

Reheat A0

2026-05-16T17:54:02Z

Elias: Add A0 errata

2026-01-18T16:49:52Z

Elias: /* Firmware for Resend */

<div class="res-img">
[[File:Retool and Resend A2.png]]
</div>
==Description==
Retool A2 is a USB based tool head that works well with Recore. It has
* 1 TMC2209 stepper motor driver for an extruder
* 1 ADXL343 accelerometer for input shaping
* 1 Mosfet for a heater
* 1 Input for thermistor
* 3 Fan outputs with tach feedback
* 1 Peltier cooling output
* 1 inductive probe input
* 1 Neopixel output
* 2 End stop inputs
* USB-C with Power delivery, up to 24 V, 5 A.
It comes with Resend A2
* 24 V injector
* USB Power delivery
* Over current protection
==Shcematics==
[https://github.com/intelligent-agent/Recore/blob/master/Schematics/Retool_A2.pdf Retool_A2]<br/>
[https://github.com/intelligent-agent/Recore/blob/master/Schematics/Resend_A2.pdf Resend_A2]
==3D models==
[https://raw.githubusercontent.com/intelligent-agent/Recore/refs/heads/master/3D-files/Retool_A2.step Retool_A2.step]<br/>
[https://raw.githubusercontent.com/intelligent-agent/Recore/refs/heads/master/3D-files/Resend_A2.step Resend_A2.step]

==Pinout diagram==
<div class="res-img">
[[File:Retool A2 pinout diagram 1.png]]
</div>
==Pinout table==
{| class="wikitable" style="width: 100%;
! Name !! GPIO !!style="border-right:solid 2px;"| Number !! Name !! GPIO !!style="border-right:solid 2px;"| Number !! Name !! GPIO !! Number
|-
| STEP || GPIO6 ||style="border-right:solid 2px;"| 6 || END STOP 1 || GPIO4 ||style="border-right:solid 2px;"| 4 || FAN 1 PWM || GPIO1 || 1
|-
| DIR || GPIO5 ||style="border-right:solid 2px;"| 5 || END STOP 2 || GPIO11 ||style="border-right:solid 2px;"| 229 || FAN 2 PWM || GPIO12 || 12
|-
| ENN || GPIO10 ||style="border-right:solid 2px;"| 10 || NEOPIXEL || GPIO20 ||style="border-right:solid 2px;"| 230 || FAN 3 PWM || GPIO21 || 21
|-
| CLK || GPIO8 ||style="border-right:solid 2px;"| 8 || NEOPIXEL DIR || GPIO19 ||style="border-right:solid 2px;"| 231 || HEATER PWM || GPIO0 || 0
|-
| DIAG || GPIO9 ||style="border-right:solid 2px;"| 9 || PELTIER EN || GPIO14 ||style="border-right:solid 2px;"| 232 || THERM 1 || GPIO28 || 28
|-
| UART || GPIO7 ||style="border-right:solid 2px;"| 9 || PELTIER V || GPIO2 ||style="border-right:solid 2px;"| 233 || CURRENT MEASURE || GPIO29 || 29
|-
| || ||style="border-right:solid 2px;"| || INDUCTIVE || GPIO19 ||style="border-right:solid 2px;"| 19 || || ||
|-
|}

==Wire diagram==
<div class="res-img">
[[File:Retool A2 wire diagram.png]]
</div>

Note about fan outputs: the middle pin is meant to be a tachometer input only. If you only have 2 wires, use only the pins labelled + and -.

==3D model==
3D model for using Retool A2 with Voron 2.4/Stealthburner
https://www.printables.com/model/1190587-voron-24-retool-a2-holder

==Klipper config==
[[File:Scheamtics.png|thumb]]
<pre>
[mcu retool]
serial: /dev/serial/by-id/usb-Klipper_rp2040_E661AC8863905924-if00

[static_digital_output retool_led]
pins: retool:gpio2

[output_pin fan_r_1]
pin: retool:gpio1

[output_pin fan_r_2]
pin: retool:gpio12

[output_pin fan_r_3]
pin: retool:gpio21

[tmc2209 extruder3]
uart_pin: retool:gpio7
uart_address: 0
run_current: 0.500
hold_current: 0.500
sense_resistor: 0.1
stealthchop_threshold: 250

#endstop_pin: retool:gpio4
#enable_pin: !retool:gpio10
#rotation_distance: 40
#microsteps: 16
#position_endstop: 0
#position_max: 200
#homing_speed: 20.0

[extruder3]
step_pin: retool:gpio6
dir_pin: retool:gpio5
heater_pin: retool:gpio0
sensor_type: EPCOS 100K B57560G104F
sensor_pin: retool:gpio28
rotation_distance: 40
microsteps: 16
nozzle_diameter: 0.400
filament_diameter: 1.75
control: pid
pid_Kp: 22.2
pid_Ki: 1.08
pid_Kd: 114
min_extrude_temp: 30
min_temp: -272
max_temp: 300

[verify_heater extruder3]
check_gain_time: 2400

[adc_temperature retool_fan_current_0]
temperature1: 0
voltage1: 0
temperature2: 33
voltage2: 3.3

[temperature_sensor retool_fan_current_0]
adc_voltage: 3.3
sensor_pin: remote:gpio29
sensor_type: remote_fan_current_0
max_temp: 2.0
gcode_id: RemoteFanCurrent0

[adxl345]
cs_pin: remote:gpio25
spi_bus: spi1c

[resonance_tester]
accel_chip: adxl345
probe_points:
100, 100, 20 # an example

[probe]
pin: remote:gpio22
#--------------------------------------------------------------------
x_offset: 0
y_offset: 25.0
z_offset: 0
speed: 10.0
samples: 3
samples_result: median
sample_retract_dist: 3.0
samples_tolerance: 0.01
samples_tolerance_retries: 3

# Set this high to use GPIO20 as high frequency input
[static_digital_output Relit_direction]
pins: !remote:gpio19

[neopixel relit]
pin: remote:gpio20
chain_count: 12

[fan peltier]
pin: remote:gpio3
max_power: 0.1
cycle_time: 0.00001 #0.01
hardware_pwm: True
</pre>

<pre>
serial: /dev/serial/by-id/usb-Klipper_rp2040_E66368651B257D22-if00

[static_digital_output remote_led]
pins: remote:gpio2

[static_digital_output nepixel_dir]
pins: !remote:gpio19

[fan]
pin: remote:gpio21
tachometer_pin: remote:gpio23
cycle_time: 0.10

[fan_generic peltier]
pin: remote:gpio3
hardware_pwm: True
cycle_time: 0.000001

[heater_fan hotend_fan]
pin: remote:gpio1
heater: extruder
heater_temp: 50.0

[tmc2209 extruder]
uart_pin: remote:gpio7
uart_address: 0
run_current: 0.800
hold_current: 0.500
sense_resistor: 0.1
stealthchop_threshold: 0

[extruder]
step_pin: remote:gpio6
dir_pin: remote:gpio5
enable_pin: !remote:gpio10
heater_pin: remote:gpio0
sensor_type: ATC Semitec 104GT-2
sensor_pin: remote:gpio28
## Update value below when you perform extruder calibration
## If you ask for 100mm of filament, but in reality it is 98mm:
## rotation_distance = <previous_rotation_distance> * <actual_extrude_distance> / 100
## 22.6789511 is a good starting point
rotation_distance: 22.6789511 #Bondtech 5mm Drive Gears
gear_ratio: 50:10 #BMG Gear Ratio
microsteps: 16
nozzle_diameter: 0.800
filament_diameter: 1.75
control: pid
pid_Kp=28.278
pid_Ki=1.611
pid_Kd=124.070
min_extrude_temp: 15
min_temp: -273
max_temp: 500
pressure_advance: 0.03
## Default is 0.040, leave stock
pressure_advance_smooth_time: 0.040

[adc_temperature remote_current]
temperature1: 0
voltage1: 0
temperature2: 10
voltage2: 1.0

[temperature_sensor remote_current]
adc_voltage: 3.3
sensor_pin: remote:gpio29
sensor_type: remote_current
max_temp: 3.0

[temperature_sensor remote_mcu]
sensor_type: temperature_mcu
sensor_mcu: remote

[adxl345]
cs_pin: remote:gpio25
spi_bus: spi1c

[resonance_tester]
accel_chip: adxl345
probe_points:
125, 125, 20

[probe]
pin: remote:gpio4
x_offset: 0
y_offset: 25.0
z_offset: 0
speed: 10.0
samples: 3
samples_result: median
sample_retract_dist: 3.0
samples_tolerance: 0.01
samples_tolerance_retries: 3

[neopixel relit_head]
pin: remote:gpio20
chain_count: 4
initial_RED: 1.0
initial_GREEN: 1.0
initial_BLUE: 1.0
</pre>

==Firmware==
Retool uses Klipper firmware. Make sure it matches the version on Recore.
Resend has a custom firmware.

=== Klipper firmware compilation ===
The unit comes with firmware pre-installed. If you want to upgrade the firmware, these are the steps to reproduce.
This can be done directly from Recore, or from a regular computer. If the device ID doesn't match, the board is not in DFU mode, and needs to be manually started that way. Use a paperclip or some wire, unplug the USB of the device, short the two round pads on the back of the PCB and plug in the USB. At that point the RP2040 will be in DFU mode, allowing it to be flashed.
<pre>
cd /home/debian/klipper
cp test/configs/rp2040.config .config
make olddefconfig
make -j
make flash FLASH_DEVICE="2e8a:0003"
</pre>
After that, the board should be visible as OpenMoko, Inc. rp2040
<div class="res-img">
[[File:Screenshot from 2024-09-04 18-41-48.png]]
</div>

====Enter boot mode from the command line ====
<pre>
cd /home/debian/klipper/scripts
python3 -c 'import flash_usb as u; u.enter_bootloader("<DEVICE>")'
Entering bootloader on <DEVICE>
</pre>
<DEVICE> is typically "/dev/ttyACM0" or similar.

===Firmware for Resend===
The Resend board has an ATTiny-1616-M. This MCU can be programmed with UPDI. A UPDI programmer can be made with a USB to TTY adapter and a 1K resistor between the Tx and the Rx pin.

To flash new firmware on Resend, use the following command from Linux:
<pre>
avrdude -p t1616 -c serialupdi -P /dev/ttyUSB0 -b 57600 -U flash:w:simple.hex:i
</pre>

The firmware is very simple for now. It enables the 24 V output without any checking at all. There is support for full USB Power Delivery capabilities, but this requires integration in Klipper, which is an upstream task.

Here is the firmware in .hex format. Named simple, because it does work, but bypasses some of the safety mechanisms (checking if the device on the other hand can tolerate 24 V). As long as you connect a Retool to the other end, it is OK.

[https://raw.githubusercontent.com/intelligent-agent/Recore/refs/heads/master/binaries/Resend/simple.hex simple.hex]

Retool A2

2026-01-18T15:51:09Z

Elias:

2025-05-14T13:22:03Z

Elias: /* Klipper config */

File:Scheamtics.png

2025-05-14T13:21:57Z

Elias:

scheamtics

Retool A2

2025-05-14T05:57:39Z

Elias: