Reheat A0 - Revision history

Elias: Add VUSB errata

2026-05-16T18:00:34Z

Add VUSB errata

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

2026-05-16T17:59:09Z

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

Elias: Add A0 errata

2026-05-16T17:54:02Z

Add A0 errata

Elias: Add full Reheat A0 documentation from schematic: pinout, hardware connections, Klipper config, flashing instructions

2026-05-16T17:49:31Z

Add full Reheat A0 documentation from schematic: pinout, hardware connections, Klipper config, flashing instructions

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Elias at 17:46, 16 May 2026

2026-05-16T17:46:12Z

Elias: Created page with "File:Reheat A0.png"

2026-05-16T17:42:15Z

Created page with "File:Reheat A0.png"

New page

[[File:Reheat A0.png]]

@@ Line 152: / Line 152: @@
 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.
-===Endstops===
+==Errata==
-Twelve endstop inputs (J14–J25) each provide +5 V, signal, and GND on a 3-pin connector. Signals are level-shifted to 3.3 V and protected by SMF24A TVS diodes. ENDSTOP-12 (J25) additionally supports a bidirectional direction signal via a SN74LVC1T45 level translator, suitable for filament motion sensors or encoders.
+# DP/DM USB data lines are swapped.
 ==Klipper configuration==

@@ Line 149: / Line 149: @@
 | Type K thermocouple || ×101 gain amplifier, buffered
 |}
 ===Endstops===
@@ Line 220: / Line 222: @@
 # 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.

← Older revision		Revision as of 17:54, 16 May 2026
Line 215:		Line 215:

	[[Category:Hardware]]		[[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.

← Older revision		Revision as of 17:46, 16 May 2026
Line 1:		Line 1:
		+
		+
		+
		+	Reheat is a 6 output heater board with temperature sensors and fans for multi material printing.
		+	<div class="res-img">
	[[File:Reheat A0.png]]		[[File:Reheat A0.png]]
		+	</div>
		+	==Hardware connections==
		+
		+	The Revolt add-on baord is designed to stack on top of the Recore A7 board. There are two dual row connectors on the Revolt board, but only one on Recore A7. The enable/disable for the TMC2160 drivers are connected to the +24V from the bottom board, so the drivers are enabled when . It is enabled by default. There is also no diag output from the drivers. Those are broken out on the two other rows and can be connected to pins on the MCU header or DBG header if sensorless homing is required.
		+
		+	==Klipper config==
		+	This config is using stepper x and y as the high voltage drivers, typical of a core-xy printer setup for speed. This gives the option of having 4 Z-drives and two extruders, 8 steppers in total.
		+
		+	This section sets up the two drivers (X = S6 and Y = S7)
		+	<pre>
		+	[tmc5160 stepper_x]
		+	run_current: 0.6
		+	hold_current: 0.2
		+	sense_resistor: 0.05
		+	cs_pin: ar100:PD0
		+	spi_software_sclk_pin: ar100:PD2
		+	spi_software_mosi_pin: ar100:PD1
		+	spi_software_miso_pin: ar100:PD3
		+	chain_position: 2
		+	chain_length: 2
		+	stealthchop_threshold: 9999
		+
		+	[tmc5160 stepper_y]
		+	run_current: 0.6
		+	hold_current: 0.2
		+	sense_resistor: 0.05
		+	cs_pin: ar100:PD0
		+	chain_position: 1
		+	chain_length: 2
		+	stealthchop_threshold: 9999
		+	</pre>
		+
		+	To route step and dir signals to the same motors:
		+	<pre>
		+	[stepper_x]
		+	step_pin: ar100:PL10
		+	dir_pin: ar100:PE14
		+
		+	[stepper_y]
		+	step_pin: ar100:PL11
		+	dir_pin: !ar100:PE15
		+	</pre>
		+
		+	==Recompiling Klipper==
		+	<div class="alert alert-warning">
		+	===='''Note'''====
		+	If you use Rebuild v1.0.0-RC0 or later, a recompilation is not necessary.
		+	</div>
		+	Klipper needs to be recompiled to add software based SPI. Starting with Refactor v3.2.0-RC3
		+	<pre>
		+	cd /home/debian/klipper
		+	nano src/Makefile
		+	<remove thermocouple.c sensor_adxl345.c and sensor_angle.c>
		+	make menuconfig
		+	<enable Support software based SPI "bit-banging">
		+	make clean
		+	make
		+	mv out/ar100.bin /opt/firmware/
		+	</pre>
		+
		+	==Tuning curves==
		+	The following oscilloscope capture shows the Revolt A1 running a NEMA 17 stepper at 30 V. The traces are A1 output (yellow) and gate for A1 (pink). The tuning looks good, very little ringing.
		+	<div class="res-img">
		+	[[File:Tuning gate and source.png]]
		+	</div>
		+
		+
		+	==Errata==
		+	# Plus and minus silkscreen has changed places.
		+	# The enable LED is lighting even though the 24 V input is not present.