The ADS1118 is a high-precision, 16-bit analog-to-digital converter (ADC) manufactured by Texas Instruments. It features an integrated programmable gain amplifier (PGA) and operates over an I2C-compatible interface. This versatile component is designed for precision measurement applications, offering low power consumption and support for multiple input channels. Its compact VSSOP package makes it ideal for space-constrained designs.
This circuit features an Arduino Due microcontroller interfaced with two ADS1115 ADC modules for differential voltage measurement. It includes a 9V battery for powering an LM324 operational amplifier, which processes input signals from multiple resistors and 21700 LI batteries. The Arduino Due reads the processed signals and communicates the data via I2C.
Open Project in Cirkit Designer
This circuit features two ESP8266 NodeMCU microcontrollers, each interfaced with a Gravity I2C ADS1115 16-Bit ADC module for analog-to-digital conversion. The microcontrollers communicate with the ADC modules via I2C protocol, with one set of connections for each microcontroller-ADC pair, and are powered through a common 3.3V and ground connection.
Open Project in Cirkit Designer
This circuit includes an ADS1115 analog-to-digital converter connected to two voltage divider networks formed by resistors. The voltage dividers are used to scale down the input voltages before they are read by the ADS1115 on channels A0 and A1.
Open Project in Cirkit Designer
This circuit is designed to measure analog voltage levels using a potentiometer and convert them to digital values with an Adafruit ADS1015 12Bit I2C ADC. The Arduino UNO serves as the controller, reading the ADC values via I2C communication and outputting the results to the serial monitor. A 9V battery powers the circuit, and a resistor is used to connect the potentiometer's output to the ADC's analog input channel AIN0.
Open Project in Cirkit DesignerThe ADS1118 is available in a 10-pin VSSOP package. Below is the pinout and description:
| Pin | Name | Type | Description |
|---|---|---|---|
| 1 | VDD | Power | Positive supply voltage (2.0 V to 5.5 V). |
| 2 | AIN0 | Analog Input | Analog input channel 0. |
| 3 | AIN1 | Analog Input | Analog input channel 1. |
| 4 | AIN2 | Analog Input | Analog input channel 2. |
| 5 | AIN3 | Analog Input | Analog input channel 3. |
| 6 | GND | Ground | Ground reference for the device. |
| 7 | SCL | Digital Input | I2C clock line. |
| 8 | SDA | Digital I/O | I2C data line. |
| 9 | DRDY | Digital Output | Data ready signal (active low). |
| 10 | NC | - | No connection. |
0x48.Below is an example of how to interface the ADS1118 with an Arduino UNO to read a single-ended input:
#include <Wire.h>
// ADS1118 I2C address
#define ADS1118_ADDRESS 0x48
// Configuration register settings
#define CONFIG_REGISTER 0x8583 // Single-ended AIN0, ±4.096V, 128 SPS
void setup() {
Wire.begin(); // Initialize I2C communication
Serial.begin(9600); // Initialize serial communication for debugging
// Configure the ADS1118
Wire.beginTransmission(ADS1118_ADDRESS);
Wire.write(CONFIG_REGISTER >> 8); // Send MSB of configuration register
Wire.write(CONFIG_REGISTER & 0xFF); // Send LSB of configuration register
Wire.endTransmission();
}
void loop() {
int16_t adcValue;
// Request conversion result
Wire.requestFrom(ADS1118_ADDRESS, 2);
if (Wire.available() == 2) {
adcValue = (Wire.read() << 8) | Wire.read(); // Combine MSB and LSB
}
// Convert ADC value to voltage (assuming ±4.096V range)
float voltage = (adcValue * 4.096) / 32768.0;
// Print the voltage to the serial monitor
Serial.print("Voltage: ");
Serial.print(voltage, 4); // Print with 4 decimal places
Serial.println(" V");
delay(500); // Wait 500 ms before the next reading
}
0x8583) sets the ADS1118 to read from AIN0 in single-ended mode, with a ±4.096 V range and a data rate of 128 SPS.No I2C Communication:
0x48) matches the ADS1118's default address.Incorrect Voltage Readings:
Device Not Responding:
Q: Can the ADS1118 measure negative voltages?
A: Yes, in differential mode, the ADS1118 can measure negative voltages relative to the reference input.
Q: What is the maximum sampling rate of the ADS1118?
A: The maximum sampling rate is 860 samples per second (SPS).
Q: How do I use the internal temperature sensor?
A: Configure the ADS1118 to read from the temperature sensor by setting the appropriate bits in the configuration register. The temperature data is returned in the conversion result.
Q: Can I use the ADS1118 with a 3.3 V microcontroller?
A: Yes, the ADS1118 operates with supply voltages as low as 2.0 V, making it compatible with 3.3 V systems.
Q: Is the ADS1118 suitable for battery-powered applications?
A: Yes, the ADS1118's low power consumption (150 µA in active mode) makes it ideal for battery-operated devices.