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:
- PCB is powered by qty 3 ‘AA’ Alkaline batteries giving an expected lifespan of up to 3 years.
- 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
- PCB is powered while programming through the connector CON4.
CON4 Pin 9 = 5V dc input
CON4 Pin 1 = 0V
- Battery voltage is monitored through the software.
- +24V is available via a MOSFET to power up external equipment from CON7 pin 1 up to 2A.
Signal Inputs:
- 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
- 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
- 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
- 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. The PCB has a 10mW onboard radio transmitting on the following unlicensed frequency bands:
868MHz
915MHz
434MHz (optional)
- 2. There are Green and Blue LEDs that are used to indicate the status of the PCB or its software.