High-Precision AD/DA Board
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Introduction
Raspberry Pi AD/DA Expansion Board is designed for Raspberry Pi and Jetson nano.
Features
- Onboard ADS1256, 8-ch 24bit high-precision ADC (4ch differential input), 30ksps sampling rate.
- Onboard DAC8552, 2-ch 16bit high-precision DAC.
- The pinout is compatible with the Waveshare sensor interface standard, easy to connect various analog sensor modules.
- Onboard terminal block encapsulates the input and output interface, which can be connected to analog signals and digital signals, which is convenient for use on various occasions.
- Features AD/DA detect circuit, easy for signal demonstration.
- Provides online sample demo of Raspberry Pi and Jetson Nano.
Pinouts
Pin Function | BCM | WiringPi | Description |
DRDY | P17 | P0 | ADS1256 data output,active-low |
RESET | P18 | P1 | ADS1256 reset input |
PDWN | P27 | P2 | ADS1256 Sync/Shutdown power input, active-low |
CS0 | P22 | P3 | ADS1256 chip select, active-low |
C1 | P23 | P4 | DAC8532 chip select, active-low |
DIN | P10 | P12 | SPI data input |
DOUT | P9 | P13 | SPI data output |
SCK | P11 | P14 | SPI clock signal |
Raspberry Pi
Provides C code and Python demo.
Open SPI Interface
- Open the Raspberry Pi terminal, and enter the configuration interface with the following commands:
sudo raspi-config Choose Interfacing Options -> SPI -> Yes to enable the SPI interface
Then reboot Raspberry Pi.
sudo reboot
- Check /boot/config.txt, and you can see 'dtparam=spi=on' was written in.
To make sure SPI is not occupied, it is recommended to close other drivers' coverage. You can use ls /dev/spi to check whether SPI is occupied. If the terminal outputs /dev/spidev0.1 and /dev/spidev0.1, SPI is not occupied.
Install Library
If you use bookworm system, only the lgpio library is available, bcm2835 and wiringPi libarary cannot be installed or used. Please note that the python library does not need to install, you can directly run the demo.
BCM2835
#Open the Raspberry Pi terminal and run the following command wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.71.tar.gz tar zxvf bcm2835-1.71.tar.gz cd bcm2835-1.71/ sudo ./configure && sudo make && sudo make check && sudo make install # For more, you can refer to the official website at: http://www.airspayce.com/mikem/bcm2835/
WiringPi
#Open the Raspberry Pi terminal and run the following command cd sudo apt-get install wiringpi #For Raspberry Pi systems after May 2019 (earlier than that can be executed without), an upgrade may be required: wget https://project-downloads.drogon.net/wiringpi-latest.deb sudo dpkg -i wiringpi-latest.deb gpio -v # Run gpio -v and version 2.52 will appear, if it doesn't it means there was an installation error # Bullseye branch system using the following command: git clone https://github.com/WiringPi/WiringPi cd WiringPi . /build gpio -v # Run gpio -v and version 2.70 will appear, if it doesn't it means there was an installation error
lgpio
#Open the Raspberry Pi terminal and run the following command wget https://github.com/joan2937/lg/archive/master.zip unzip master.zip cd lg-master sudo make install #Raspberry Pi 5 sudo apt install python3-rpi-lgpio #For more details, you can refer to https://github.com/gpiozero/lg
- python
sudo apt-get update sudo apt-get install ttf-wqy-zenhei sudo apt-get install python-pip sudo pip install RPi.GPIO sudo pip install spidev
Download Demo
Run in raspberry pi terminal:
sudo apt-get install p7zip-full wget https://files.waveshare.com/upload/5/5e/High-Precision-AD-DA-Board-Code.7z 7z x High-Precision-AD-DA-Board-Code.7z -r -o./High-Precision-AD-DA-Board-Code cd High-Precision-AD-DA-Board-Code/RaspberryPI/
AD Demo
cd ADS1256
Provides four demos: bcm2835, python2, python3, wiringpi.
- Hardware Settings
Set the Power Supply to 5V: connect 5V to VCC.
Set the Reference Input Voltage to 5V: connect 5V to VREF.
Set the Potentiometer output as an Analog Input: connect the pin ADJ and AD0. Make sure the left side Sensor Interface AD0 is disconnected.
Set the LDR output as an Analog Input: connect the pin LDR and AD1. Make sure the left-side Sensor Interface AD1 is disconnected. Connect AINCOM to AGND. When using AD for differential measurements, the common input AINCOM does not need to be tied to the ground.
1. bcm2835
cd bcm2835/ make sudo ./ads1256_test
Notice: If you have run BCM2835 libraries, you need to reboot Raspberry Pi so as to run other libraries successfully.
2. wiringpi
cd wiringpi/ make sudo ./ads1256_test
3. python2
cd python2/ sudo python main.py
4. python3
cd python3/ sudo python3 main.py
- Experiment Phenomenon:
Turn the potentiometer, the AD0 channel voltage will change accordingly.
Block the photoresistor, and the AD1 channel voltage changes accordingly.
Since other channels are not connected to the load, the related pins float around 1.17V.
DA Demo
cd DAC8532/
Provides four demos: bcm2835, python2, python3, wiringpi.
- Hardware setting
Set the Power Supply to 5V: connect 5V to VCC.
Set the Reference Input Voltage to 5V: connect 5V to VREF.
Connect DA0 to LEDA and DA1 to LEDB. Then the brightness of the indicator LEDA will change according to the DA0 output voltage. The brightness of the indicator LEDB will vary according to the DA1 output voltage.
1. bcm2835
cd bcm2835/ make sudo ./dac8532_test
Notice: If you have run BCM2835 libraries, you need to reboot Raspberry Pi so as to run other libraries successfully.
2. wiringpi
cd wiringpi/ make sudo ./dac8532_test
3. python2
cd python2/ sudo python main.py
4. python3
cd python3/ sudo python3 main.py
- Experiment Phenomenon:
Breathing light effect in LEDA and LEDB.
AD/DA synthetical demo
cd AD-DA/
Provide demo: bcm2835, python.
1. bcm2835
cd bcm2835/ make sudo ./main
Notice: If you have run BCM2835 libraries, you need to reboot Raspberry Pi so as to run other libraries successfully.
2. python
cd python/ sudo python main.py
- Experiment Phenomenon
After rotating the potentiometer, the two LEDs will light up alternately.
Jetson nano Developer Kit
Jetson nano program uses analog SPI, so SPI rate or sample rate is relatively slower.
Software setting
Install Function Libraries:
- Open the terminal interface and enter the following commands to install function libraries.
cd python/ sudo apt-get update sudo apt-get install python3-pip sudo pip3 install Jetson.GPIO sudo groupadd -f -r gpio sudo usermod -a -G gpio your_user_name sudo cp /opt/nvidia/jetson-gpio/etc/99-gpio.rules /etc/udev/rules.d/ sudo udevadm control --reload-rules && sudo udevadm trigger
- Install I2C:
sudo apt-get install python-smbus
- Install image processing libraries
sudo apt-get install python3-pil sudo apt-get install python3-numpy
Download Testing Demo
Open linuxterminal and execute:
sudo apt-get install p7zip-full wget https://files.waveshare.com/upload/5/5e/High-Precision-AD-DA-Board-Code.7z 7z x High-Precision-AD-DA-Board-Code.7z -r -o./High-Precision-AD-DA-Board-Code cd High-Precision-AD-DA-Board-Code/Jetsonnano/
AD Demo
cd ADS1256
Provides three demos: c, python2, python3.
- Hardware Setting
Set the Power Supply to 5V: connect 5V to VCC.
Set the Reference Input Voltage to 5V: connect 5V to VREF.
Set the Potentiometer output as an Analog Input: connect the pin ADJ and AD0. Make sure the left side Sensor Interface AD0 is disconnected.
Set the LDR output as an Analog Input: connect the pin LDR and AD1. Make sure the left-side Sensor Interface AD1 is disconnected. Connect AINCOM to AGND. When using AD for differential measurements, the common input AINCOM does not need to be tied to the ground.
cd C/ make sudo ./main
2. python2
cd python2/ sudo python main.py
3. python3
cd python3/ sudo python3 main.py
- Experiment Phenomenon:
Turn the potentiometer, the AD0 channel voltage will change accordingly.
Block the photoresistor, and the AD1 channel voltage changes accordingly.
Since other channels are not connected to the load, it is not connected, so it floats around 1.17V.
DA Demo
cd DAC8532/
Provides three demos: c, python2, python3.
- Hardware Setting:
The operating voltage is set to 5V: connect 5V to VCC.
The reference voltage is set to 5V: connect 5V to VREF.
Connect DA0 to LEDA and DA1 to LEDB. Then the brightness of the indicator LEDA will change according to the DA0 output voltage. The brightness of the indicator LEDB will vary according to the DA1 output voltage.
1. C
cd C/ make sudo ./main
2. python2
cd python2/ sudo python main.py
3. python3
cd python3/ sudo python3 main.py
- Experiment Phenomenon:
Breathing light effect in LEDA and LEDB.
AD/DA demo
cd AD-DA/
Provides three demos:c, python2, python3.
1. C
cd C/ make sudo ./main
2. python2
cd python2/ sudo python main.py
3. python3
cd python3/ sudo python3 main.py
- Experiment Phenomenon:
After rotating the potentiometer, the two LEDs will light up alternately.
Resource
Documentation
Datasheets
Application Notes
- CP2102
- PCF8563
- Writing the Img to the SD card
- Libraries Installation for RPi
- Panasonic_SDFormatter
- Win32DiskImager
- putty
- wiringPi & bcm2835 C LIB
FAQ
The sample demo enables 8-channel high-precision ADC by default. To ensure stability and accuracy, the program adds a delay when reading and processing data. If a higher rate is required, the delay can be commented out.
High-Precision-AD-DA-Board-1CH
- The unconnected idle channel shows 5.08V; it is a normal phenomenon due to the internal structure of the chip.
- The default floating voltage is 5.08V, which does not affect the use. If you do not need other channels, you can close this channel or connect it to GND
- Compatible with STM32.
- For more models about STM32, you can refer to the following STM32F10X demo to compile and port: sample demo.
Yes, it supports Raspberry Pi 4B.
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sudo modprobe spidev
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Support
Technical Support
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