HADIn2( )
variable = HADIn2(channel combination)
| variable | Variable to store the result (Integer or Long type) |
| channel | Combination: AD channel combination code |
This command is for a differential A/D input. Two channels are paired up, and the A/D converter converts the difference between the two voltages.
| Channel combination code | + Input | - Input |
|---|---|---|
| 0 | CH0 | CH1 |
| 1 | CH2 | CH3 |
| 2 | CH4 | CH5 |
| 3 | CH6 | CH7 |
| 4 | CH1 | CH0 |
| 5 | CH3 | CH2 |
| 6 | CH5 | CH4 |
| 7 | CH7 | CH6 |
#include "CB405RT" Do Debug Goxy,1,1,Dec5 Hadin2(0) Wait 500 Loop
TIP
For a more accurate measurement, one should start with a reliable power source. A Linear power source (e.g., using 7805, etc.) is better for A/D input than a switching power source circuit (e.g., using LM2576).
Also, when the A/D input pins are extended and exposed outside the board, a protection circuit (where additional chips such as the isolation circuit, etc. are involved) should be added to protect the core module from external noise.
Keep in mind that, especially when a voltage over 5V could be applied to the A/D input port, repairable damage can occur to the module