ENVO32 is designed as a programmable serial environment control module for server cabinets, green houses or other small spaces. You can configure triggers on ENVO32 with simple serial commands based on temperature,humidity and input ports to output ports and switches.

Features

• On board temperature and humidity sensor
• 5 digital input, digital output, analog input generic IO ports with configurable weak pull ups and 220R current limiting resistors.
• 2 digital input, digital output, analog input generic IO ports with on board 10K pull up resistors.
• 2 low side MOSFET switches for driving larger loads like fans, relays, solenoids, coolers, heaters etc...
• Programmable triggers between ports, switches, temperature and humidity sensors
• RS232 serial reading and programming
• Simple set of serial commands to configure ports and triggers
• 3.5mm screw terminals for all ports with a ground terminal for each port
• Screw holes for mounting compatible with pcb DIN rail mount clips

IO Ports

P0-P4 Ports P0,P1,P2,P3,P4 are generic IO ports which can be configured as digital inputs, digital outputs or analog inputs.

• On board 220R current limiting resistors
• Drive LEDs or connect switches without worrying about current limiting decreasing component count.
• Programmable weak pull ups.
• Best for directly driving LEDs, digital out to other devices, reed and toggle switches, driving servos

P7,P8 Generic IO ports which can be configured as digital inputs, digital outputs or analog inputs.

• On board 10K pull-up resistors.
• Best for extra analog resistive sensors such as photoresistors and thermistors

S0,S1 Low side mosfet switches.

• Each switch has one port and one ground such as S0 and GND.
• Ports are internally tied to unregulated power source.
• Corresponding GNDs are switched by fets.
• Up to 5A switching capability.
• Best for driving fans, relays, inductive loads such as dc motors and other larger loads.

Temperature And Humidity - On board DHT22 temperature, humidity sensor - Can be read from serial and/or used as values for triggers.

Commands

Temperature And Humidity
Command: ct t0
Returns temperature in Celsius. Example: for 27.4 C, will return 274
Command: ct t1
Returns humidity percentage. Example: for 65.5%, will return 655

Digital read
ct p0=$
Reads the port and returns 0 or 1

Enable,Disable Weak Pull Up
ct p0=u (Pull-up enabled)
ct p0=f (Port floating, pull-disabled)

Digital Write
ct p0=1
ct p0=0

Analog Read
ct p0=a
Returns a 10 bit analog reading from the given port

Setting up triggers
ct p0=:p5=0
p0 is digital one if p5 is digital zero

ct p2=:p7<512
p2 is digital one if analog value on p7 is smaller than 512 else p2 is digital 0

ct s0=:t0>300
s0 switch is closed if temperature is higher than 30 C

ct p0=:t1>600
p0 is digital one if humidity is higher than 60 percent

Show triggers
ct p0=t
Will print if a trigger is set

Clear Trigger
ct p0=:x
Removes if a trigger is set up for port P0

Error Codes
NC: No such command
NP: No such port
NE: No execution , no trigger defined or operation not available for given port

Serial Connection Serial communication protocol is RS232 with following parameters

• Baud rate 9600
• Data Bits 8
• Parity None

• Stop Bits 1

  These communication parameters are chosen as they pretty much work for every RS232 device and transmission speed is more than enough for any application I can think of. Note that this is device can communicate over RS232 no UART, meaning you can't use usb serial UART adapters to communicate with ENVO32. You can use an FTDI usb adapter but you have to reprogram it to invert both RX and TX. To do that you can download FT_Prog from FTDI and invert receive transmit as in this image. You won't have any problems with real RS232 devices. Feel free to PM me any questions, will be glad to answer them.

Specifications

Input voltage           3-16V
Standby current         5ma @9V
Max. Current IO         25ma
Max. Switch Current     5A @16V