Examples for the platform agnostic driver to interface with the HX711 (load cell amplifier and 24 bit ADC)
Connect HX711 DOUT to PA6 and SD_CLK to PA7.
Logging is provided by USART1: TX on PA9 (no RX).
The cargo configuration is included in .cargo/config, depending on your system, you will need to adjust the linker name.
If using the SEGGER JLink, just run:
> cd hx711-examples/stm32f1xx-hal
> cargo build
terminalA> /opt/SEGGER/JLink/JLinkGDBServer -device STM32F103C8 -if SWD
terminalB> arm-none-eabi-gdb -x jlink.gdb target/thumbv7m-none-eabi/debug/firmware
terminalC> picocom -b 9600 --imap lfcrlf /dev/ttyUSB0 # you will see weight values here
Since the HX711 driver uses pin toggling to implement the custom communication protocol, the reading can be interrupted by the kernel. Thus, the RaspberryPi example should be run with isolated CPUs or with a realtime linux scheduler. (Sorry, no instructions yet.)
Connect DOUT to GPIO23 (Pin 16) and SD_CLK to GPIO24 (Pin 18).
Cross build it with:
cargo build --target armv7-unknown-linux-musleabihf
then transfer to the Raspberry Pi. Start with a low nice value to make the timing better.
Licensed under either of
- Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)
at your option.