Overview

The WDTTHERM v1.0 PCB has lots of useful onboard features making it invaluable in a mass manufacturing environment. It has onboard humidity and temperature sensing, multiple power options and both thermocouple and analogue/digital inputs. The pcb can also be used to power up external equipment.

All the data it collects is sent via unlicensed radio for your convenient wireless harvesting from a suitable and convenient location within or nearby the building of interest.

Power Supply:

1. PCB is powered by qty 3 ‘AA’ Alkaline batteries giving an expected lifespan of up to 3 years.
2. PCB can also be powered by an external dc supply of between +5 and +24V applied to connector CON7.
   CON7 Pin 3 = +5V to +24V dc input
   CON7 Pin 4 = 0V
3. PCB is powered while programming through the connector CON4.
   CON4 Pin 9 = 5V dc input
   CON4 Pin 1 = 0V
4. Battery voltage is monitored through the software.
5. +24V is available via a MOSFET to power up external equipment from CON7 pin 1 up to 2A.

Signal Inputs:

1. Up to 5 Analogue signals can be presented to connectors PL1 to PL5.
   Pin 1 = +24V from external DC supply from CON7 pin 3
   Pin 2 = Analogue input 0 – 10V or Digital Input 0 – 20V
   Pin 3 = 0V or Ground
2. Up to 5 K Type Thermocouples can be presented to connectors PL6 to PL10.
   Pin 1 = TC +
   Pin 2 = TC –
   Temperature range +0°C to + 700°C
   Error range = +/- 3°C
3. The PCB has an onboard humidity sensor with the following specification:
   Temperature range +5°C to + 50°C (41°F to 122°F)
   Humidity range 10% RH to 90% RH
   Error range = +/- 5% RH
4. The PCB has an onboard temperature sensor with the following specification:
   Temperature range +5°C to + 50°C (41°F to 122°F)
   Error range = +/- 1°C

Radio:

1. 1. The PCB has a 10mW onboard radio transmitting on the following unlicensed frequency bands:
   868MHz
   915MHz
   434MHz (optional)
2. 2. There are Green and Blue LEDs that are used to indicate the status of the PCB or its software.