YOu will have to refer to the manaul on this one.
The EXT inputs for the DrDAQ use a resistor to sense the input range. YOu will have to create a DrDAQ DDS file as mentioned in the manual.
Here is the basic outline:
Each external input socket has four connections:
1 Input channel with 100k pull-up to 2V5
3 Sensor type detect with 100k pull-up to 2V5
4 Power approx 2mA at 3-5V
The DrDAQ driver has built-in scaling for each of the built-in and Pico-supplied sensors. You can incorporate scaling for your own sensors by adding a file called drdaq.dds, which contains details of your sensor.
For external sensors, this resistor should be fitted in the sensor. Customers should use one of the following resistors: 1k0, 2k2, 3k3, 5k6, 7k5 and 10k. The resistor used should be 1% tolerance or better.
The following resistor values are reserved and must not be used: 330k, 220k, 180k, 150k, 120k, 110k, 100k, 91k, 82k, 75k, 68K.
For internal sensors, the following 'virtual' resistor values should be used:
1 Sound Waveform 1200
2 Sound Level 1300
3 Voltage 1500
4 Resistance 1600
5 pH 1400
6 Temperature 1100
7 Light 1000
I hope this helps.
Michael - Tech Support
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