Symbol descriptions
1) AD/DA input/output (Tab 2)
AD0-AD7: Analog input
AGND: Analog ground
GND: Digital ground
VCC: Power supply (3.3V and 5V optional, can be switched by setting the Power selection jumper)
DA0-DA1: Analog output
2) Analog input (Tab 3)
AD0-AD7: ADS1256 analog input
D0-D3: GPIO of ADS1256 (See ADS1256 datasheet)
P22-P25: GPIO of Raspberry Pi
AGND: Analog ground
3) LDR: Light-dependent resistor, i.e. Photo resistor (Tab 6)
By connecting the jumper between AD1 and LDR, the MCU can read the voltage output of LDR
from the pin AD1.
4) LEDA/LEDB: LED output indicator (Tab 7)
By connecting the jumper between LEDA/LEDB and DAC0/DAC1, the voltage output of
DAC0/DAC1 can be estimated roughly by the brightness of LEDA/LEDB.
5) ADJ: The adjustable resistor of the 10K potentiometer (Tab 8)
By connecting the jumper between AD0 and ADJ, the MCU can read the voltage output of the
potentiometer from the pin AD0
6) PWR LED: Power indicator (Tab 10)
7) Power selection jumper (Tab 14)
VCC: Power supply selection
VREF: Reference input voltage
3V3: 3.3V output
5V: 5V output
8) JMP_AGND: Analog ground jumper(Tab 15)
For single-ended measurements, use AINCOM (Analog input common) as common input, which
can be connected to AGND or external reference voltage. For differential measurements, do not
use AINCOM.
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