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Short description: Attach analogue sensor or make DC voltage measurement with a microcontroller or Raspberry Pi via the I2Cport.
Intended for any microcontroller capable of communicating with ADS1115/ADS1110 though I2C.
Gives you 4 analogue inputs.
Problem: You like to extend your microcontroller with further analogue sensor or voltage measurements – or have an Raspberry Pi which is without an analogue input pins.
Solution: Use this board to combine the ADS1115/ADS1110 with THT or SMT/SMD resistors (1206/0804) of your choice to reach the desired voltage level of the sensor or other sources.
THT: Through hole technology
SMT/SMD: Surface-mount technology/surface-mount device
Examples:
If you use R14 = 50K Ohm and R4 = 50K Ohm, the voltage will be divided to the half. This means, if the input A.IN gets 5V in, the voltage divider will make 2.5V out of it. If the 5V changes to 4V, the voltage divider will make 2V out of it.
If you use R14 = 30K Ohm and R4 = 70K Ohm, the voltage will reduced to 30%. This means, if the input A.IN gets 5V in, the voltage divider will make 1.5V out of it. If the 5V changes to 4V, the voltage divider will make 1.2V out of it.
The ADS1115/ADS1110 will convert this to a integer value between 0 and 4095 according to its specifications and resolution settings.
Tip:
1.) You can find calculators for voltage dividers on many sites online.
2.) Measure the resisters exactly and use these numbers for the calculation og the voltage divider as this increases the accuracy.
3.) Don’t use it as it is for AC measurements. Be careful with voltages above 60 volt due to health risks.
