Nano RC12-2

• uses a Nano (with ENC28J60 Ethernet shield) & an on-board mounted Cytron for rate control
  • either (1) MD13S for single rate control
  • or (1) MD10C for single rate control
• self assembled through-hole board, least expensive
• controls one rate
• can be connected to a relay module with another small pcb
• OSHPARK

Teensy 4.1 RC11

• uses a Teensy & an on-board mounted Cytron for rate control
  • either (1) MD13S for single rate control
  • or (1) MDD10A for dual rate control
• small components are surface mount parts
• Teensy Ethernet or ESP8266 (ESP-12F) Wifi
• can control two rates and eight sections
  • 8 relays (SPST 12V output)
  • (2) 5V analog (pressure) inputs
  • (2) optically isolated digital (rate/pulse) inputs (5V)
• 5V Serial TTL header
• 3.3V I2C headers
  • supports optional external RelayDriver5 I2C board

ESP32 RC15

• uses an ESP32 (optional W5500 Ethernet Module)
• mostly surface mount parts
• can control two rates and 7-14 sections
  • (2) DRV8870 motor drivers with reversible outputs for rates
  • (7) DRV8870 motor drivers for either 7 reversible (motorized ball valve) outputs or 14 single ended (high or low) section outputs
• (4) 5V analog inputs (or 2 differential inputs)
• (2) optically isolated digital (rate/pulse) inputs, up to 12V
• RS485 chip & header
• 3.3V I2C header
  • supports optional external RelayDriver5 I2C board

RelayDriver5

• PCA9535 based I2C IO expander
• designed to plug into 8 or 16 channel relay board with Qwiic cable