Quick Start
This guide introduces the FoBE Breakout ADS1115 and how to use it.
Hardware diagram
The following figure illustrates the FoBE Breakout ADS1115 hardware diagram.
Mechanical dimensions
FoBE Breakout ADS1115 is a single-sided 25.4mm x 25.4mm (1" x 1") PCB. Fixing by 4-6 1.6mm Screw holes.
Interfaces
The board provides two 4-pin SH1.0 connectors providing IIC connections.
| Interface | Description |
|---|---|
| 3V3 | Power supply |
| GND | Ground |
| SDA | I2C bus data line |
| SCL | I2C bus clock line |
And there is a 6-pin 2.54mm header holes also used for IIC connections:
| Interface | Description |
|---|---|
| NC | No use |
| GND | Ground |
| 3V3 | Power supply |
| SDA | I2C bus data line |
| SCL | I2C bus clock line |
| INT | ADC conversion trigger pin |
Address Selection
ADC
The IIC address of the ADS1115 can be configured using the B0-B3 solder pads.
| Pad | IIC Address (Binary) |
|---|---|
| B0 | 01001000 |
| B1 | 01001001 |
| B2 | 01001010 |
| B3 | 01001011 |
EEPROM
The IIC address of the EEPROM can be configured using the A0-A2 solder pads. The bits [3:1] are A2, A1, and A0. The last bit is determined by the operation: write (0) or read (1).
| A2 | A1 | A0 | IIC Address (Binary) |
|---|---|---|---|
| 0 | 0 | 0 | 1010000x |
| 0 | 0 | 1 | 1010001x |
| 0 | 1 | 0 | 1010010x |
| 0 | 1 | 1 | 1010011x |
| 1 | 0 | 0 | 1010100x |
| 1 | 0 | 1 | 1010101x |
| 1 | 1 | 0 | 1010110x |
| 1 | 1 | 1 | 1010111x |
(x: 0 for write, 1 for read)
Measure Connection
| Channel | Measure | Description |
|---|---|---|
| 0 | 4-20mA current measurement | Measured a voltage by a 120Ω resistor to ground |
| 1 | Voltage measurement (0-10V) | Measured through a voltage divider consisting of 10 KΩ (top) and 39 KΩ (bottom) |
| 2 | NTC thermistor measurement | Measured by a voltage divider circuit, configured with a 100kΩ resistor and powered by an internal 2.5V reference |
| 3 | ADC calibration | connected to internal voltage reference(2.5V) |
ADC-INT
The feature of ADC conversion ready no enable by default. If you want to use the INT pin, you need to solder the jumper pad ADC-INT. That connect the ADC pin: "ALERT/RDY" to the Ground.
Programming
FoBE Quill nRF52840 Mesh Example
The FoBE Quill nRF52840 Mesh development board provides multiple digital gpio; pins D2, D1, D0 are used in the example:
#include <TinyGPSPlus.h>
#include <SoftwareSerial.h>
......