This project implements a compact DC motor speed controller using a RISC-V microcontroller.
It is designed for speed control via pulse feedback from a light barrier and communicates through a serial interface. Additional sensors can be attached using I2C.
Beware that the entire PCB isn't a masterpiece as this is just for technology evaluation.
Mostly for playing around with very cheap RISC-V microcontrollers and an execise for C/Rust with very limited resources. It can be used for controlling simple toy robot chassis that usually have two DC motors with light barriers which can be used as feedback loop for a speed control algorithm.
- AP62300 (3A Buck Converter) → 7V rail (for DC motors)
- AMS1117-3.3 (LDO Regulator) → 3.3V rail (for microcontroller and motor driver logic)
- 48 MHz RISC-V core
- 16 KB Flash / 2 KB SRAM
- Powered from 3.3V rail
- Brushed DC motor driver
- 1.8A continuous current capability
- Logic powered from 3.3V rail
- DC motors powered from 7V rail
| Pin | Meaning |
|---|---|
| PC5 | motcon1_sleep |
| PC6 | motcon1_in2 |
| PD2 | motcon1_pwm_in1 |
| Pin | Meaning |
|---|---|
| PC3 | motcon2_sleep |
| PC4 | motcon2_in2 |
| PA1 | motcon2_pwm_in1 |
| Pin | Meaning |
|---|---|
| PC0 | pwm_speed_input1 |
| PD3 | pwm_speed_input2 |
| Pin | Meaning |
|---|---|
| PC1 | i2c_sda |
| PC2 | i2c_scl |
| PD5 | usart_tx |
| PD6 | usart_rx |
| Pin | Meaning |
|---|---|
| PD1 | SWDIO |
| PD7 | nRST |
| Pin | Meaning |
|---|---|
| PA2 | status_led |
| Pin | Meaning |
|---|---|
| PC7 | X |
| PD0 | X |
| PD4 | X |
CERN OHL v2 – Strongly Reciprocal (S)