DFR0646 8 Digital LED Segement Display SDA and SDL Voltage
Jan.Wild 2023-05-14 13:50:21 238 Views2 Replies I have a DFR0646 and would like to use it with a Seeed Studio XIAO ESP32C3. the ESP32 has a PIN voltage of 3.3V. However, I can't find any information about the voltage that the DFR0646 needs at the PIN's SDA and SCL. nothing happens with the example program in the Arduino library that should display Halo.
In the IIC protocol, if there is no special specification, the high level of SDA/SCL is often above 0.7VDD. Since the power supply of DFR0646 must be DC 5V, the high level of SDA/SCL may need to be 3.5V.But it is still recommended that you use an external 5V power supply to supply power to DFR0646, and share GND. Then use the IIC scanner code to check whether the IIC address can be scanned correctly. If the address can be scanned, but cannot be driven by the sample code, it is likely that this is the problem of IIC level mismatch.
IIC scanner code：https://playground.arduino.cc/Main/I2cScanner/
Yeez_B Make sure that the I2C address of the DFR0646 is correct. The default address is usually 0x62, but some modules may have a different address. You can use an I2C scanner program to detect the address of your module.
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