CTRL HAT
0x20I/O board for use with solid state power relays. Designed for switching high power loads without the need for costly extra hardware such as SSR modules or contactors.
Ideally suited to automation or industrial control applications requiring high-speed switching, or switching of loads not suitable for regular mechanical relays, such as motors, power supplies, or noise sensitive equipment such as amplifiers.
Features
- Support 4 industry standard SIP type solid state relays
- Based on the MCP23017 16-port GPIO expander
- Jumper selectable I2C address & GPIO voltage (3.3V / 5V)
- Huge range of compatible solid state relays (known list)
- Up to 10A @ 250V / 16A @ 250V (forced air cooled)
- Can be used with 3.3V or 5V I2C host devices (eg, Arduino)
- Built-in user programmable ID EEPROM
Details
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WiringPi Guide
Read
gpio -x mcp23017:100:0x20 read 108
Write
gpio -x mcp23017:100:0x20 mode 108 out
gpio -x mcp23017:100:0x20 write 108 1
- Operating voltage: - 1.8V to 5.5V
- Maximum current into VDD pin: 125mA
- Maximum current out of VSS pin: 150mA
Isolating the Relays
Removing the LINK jumper will disconnect 5V power to the relays. This allows you to power the relays independently, but also gives you the option to use solid state relays with other DC control voltages (up to 30V). This opens up a huge range of additional compatible solid state relays for use with your project.
GPIO Voltage
The 3V3 Jumper is used to drive the GPIO expander voltage to 3V3.
To use with Arduino or any other 5V device the 3V3 jumper must be moved to 5V.
GPIO Voltage
The 5V Jumper is used to drive the GPIO expander voltage to 5V.
Select this jumper to use with Arduino or any other 5V device and use the SDA & SDL breakout pins for I2C communication.