dS2824
dS2824 User Manual v4.12
Temperatue sensor
There is an on-board temperature sensor (MCP9700A) which provides a 10mV/°C output on a
500mV offset (0°C = 500mV, 1°C = 510mV). This is accessed as analogue channel 100. The
sensor is located between the Ethernet and RS485 connectors.
analogport TS1 100 ; on-board temp sensor
int32 BrdTemp
BrdTemp = ((TS1*3223)-500000)/10000
This will give you the approximate temperature in °C.
Power supply input voltage
A simple resistive divider on analogue channel 101 is used to measure the 12v input voltage.
analogport PSU 101 ; DC power voltage
int32 Volts
Volts = PSU*18369/100000 ; calc input voltage.
This will give you volts*10. So 119 = 11.9v, 120 is 12.0v
Analogue channels
100 Temperature
101 Voltage
Channels 1–8 are Flexport channels, 12-bit resolution using 5v from regulator as reference.
Channels 100,101 are 10-bit resolution, using CPU 3.3v supply as reference.
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