f072_voltmeter
This project uses an STM32F072 Cortex M0 based MCU in combination with a CS5509 16 bit ADC to read voltages from 0V up to 3V in unipolar mode.
In this current configuration, fed by a 32.768kHz clock, the ADC sends data at 20 Samples/s through the SPI protocol.
The microcontroller then sends this data to the USART peripheral.
For more precise applications, look at this application note
Pin connections
| STM32F072 | Connection |
|---|---|
| PA2 | USART TX |
| PA3 | USART RX |
| PA5 | SPI SCK |
| PA6 | SPI MISO |
| PA7 (unused) | SPI MOSI |
| PC5 | SPI CS |
| PC6 | ADC CONV |
| PC7 | ADC DRDY |
| PC8 | ADC CAL |
| PA8 | ADC CLOCK |