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RPI Hat for reef-pi

Supports

• Back powering the rpi with 5v
• 9 channels of PWM control via PCA9685 (split between 3 connectors)
• 3 channels for 1 wire communication (up to 3 DS18B20 temperature probes)
• 2 i2c ports for ph probe modules
• 2 ATO sensors
• 8 channel 12v relay control via ULN2803
• 8 GPIO breakout (intended for 3.3v relay module)