Android MODBUS Relay Control
This Android project can control up to 64 individual 8 channel R421A08 relay boards using a IOIO Bluetooth interface.
Hardware
The following hardware is required for this project:
- One or more R421A08 relay boards.
- IOIO OTG.
R421A08 relay board
- RS485 (binary) interface.
- 8 x 12V Relays: 10A 125VAC / 10A 28VDC.
- 8 status LED's.
- 6 DIP switches for 64 board addresses.
- Board power: 12V DC.
- Current board idle: ~11mA.
- Current one relay: ~26mA.
- Current all relays on: ~220mA.
- Length: 90mm, width: 60mm, height: 20mm.
WARNING: DO NOT USE THIS RELAY BOARD WITH 230V AC!
The distance between relay traces on the PCB are < 2mm without holes for isolation. This is dangerous when using it with high voltages. See the picture above.
IOIO OTG
IOIO OTG board provides I/O interface for Android via Bluetooth.
