![]() Maybe because the board was on standoffs to preserve the bottom side components ? I've never had this happen before. Some of the connections didn't reflow well. Placing components on the bottom side Ready for bottom side reflow Top side reflow With correct cable impedance and shielding, long cable distances can be used without altering the signal. The Farfadet data bus is a differential RS485-like bus, referenced to 3.3V. It is designed to plug on a Teensy 3.x board but could be used with any 3.3V / 5V device with a serial port. It is used to generate the data bus for the Farfadet modules from a microcontroller. The 3 boards strapped on the back of a NEMA23 stepper : magnetic encoder, then TMC5130 driver, then XLR connectors. The 3 main Farfadet boards : XLR (background left), TMC5130 driver (background right), AS5132 magnetic encoder (foreground) This board can be mounted on NEMA17 and NEMA23 motors.Īdds XLR connectors (rugged and standard in the entertainment industry) for the Farfadet data bus instead of the standard Picoblade connectors. Unfortunately the TMC5130 doesn't support closed loop operation so this is only for failure detection. It has a theoretical 1° resolution and can be used to control the stepper operation and correct position in case of missed steps. This board supports a magnetic absolute encoder IC from AMS : the AS5132. ![]() ![]() It has a NEMA17 form factor and can be mounted directly on the back of a stepper motor.įarfadet TMC5130 - v1.0 (red) vs v1.1 (green) The magnetic encoder board No need to generate a Step/Dir signal from a microcontroller with a library such as AccelStepper, it will always operate jitter-free and with 256 microsteps.Īdditionally, this chip can run in a silent mode called stealthChop and integrates advanced features from Trinamic like stall detection (useful for sensorless homing). ![]() This is a very complete chip that integrates a hardware ramp generator : it only needs a power supply (12 - 45V) and a serial data bus to operate. It is based on Trinamic's TMC5130A and can drive a single stepper motor with up to 1.5A / phase. At the moment, the Farfadet collection is composed of the following boards : The main Farfadet board ![]()
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March 2023
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