The Adafruit ADS1015 is a precision, low-power, 12-bit analog-to-digital converter (ADC) equipped with an I2C-compatible interface. It offers four multiplexed inputs and can measure signals with a variety of gains, allowing for a range of ±2.048V. This component is ideal for applications requiring accurate analog-to-digital conversion, such as sensor data acquisition, voltage monitoring, and signal analysis. Its small size and ease of use make it suitable for prototyping and integration into existing projects.
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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.
This circuit features a Raspberry Pi 4B as the central processing unit, interfaced with an Adafruit ADS1115 16-bit I2C ADC for analog-to-digital conversion and a 0.96" OLED display for visual output. The ADS1115 is connected to a current sensor for measuring electrical current, with the sensor's output and burden pins connected to the ADC's analog input channels. The Raspberry Pi communicates with both the ADC and the OLED display over the I2C bus, using its GPIO2 and GPIO3 pins for data (SDA) and clock (SCL) lines, respectively.
This circuit features a Raspberry Pi 4B as the central processing unit, interfaced with an Adafruit ADS1115 16-bit I2C ADC for analog-to-digital conversion and a 0.96" OLED display for visual output. The ADC is connected to a current sensor for measuring electrical current, with the sensor's output connected to the ADC's AIN0 pin and the burden resistor connected to AIN1. The Raspberry Pi communicates with both the ADC and the OLED display over the I2C bus, using GPIO2 (SDA) and GPIO3 (SCL) for data exchange.
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.
Connect SCL and SDA to the I2C clock and data lines, respectively.
Set the ADDR pin to the appropriate logic level to determine the I2C address.
Connect the analog input(s) to A0-A3 as required for your application.
Optionally, use the ALERT pin for conversion ready or threshold alert functions.
Best Practices
Use pull-up resistors on the SCL and SDA lines as required by the I2C protocol.
Keep analog signal paths as short as possible to minimize noise.
Decouple the power supply with a 0.1 µF capacitor close to the VDD pin.
Configure the ADS1015's registers according to your application's requirements.
Example Code for Arduino UNO
#include <Wire.h>
#include <Adafruit_ADS1015.h>
Adafruit_ADS1115 ads; // Use this for the 16-bit version
void setup(void) {
Serial.begin(9600);
ads.begin(); // Initialize the ADS1015
}
void loop(void) {
int16_t adc0, adc1, adc2, adc3;
// Read all four channels and print them out
adc0 = ads.readADC_SingleEnded(0);
adc1 = ads.readADC_SingleEnded(1);
adc2 = ads.readADC_SingleEnded(2);
adc3 = ads.readADC_SingleEnded(3);
Serial.print("AIN0: "); Serial.println(adc0);
Serial.print("AIN1: "); Serial.println(adc1);
Serial.print("AIN2: "); Serial.println(adc2);
Serial.print("AIN3: "); Serial.println(adc3);
Serial.println(" ");
delay(1000); // Pause for a second
}
Troubleshooting and FAQs
Common Issues
No response from the device: Ensure that the I2C address is correctly set and that the SCL and SDA lines are properly connected with pull-up resistors.
Inaccurate readings: Check that the input voltage is within the specified range and that the PGA gain is correctly configured.
Noisy signal: Ensure that the analog input lines are kept short and away from high-frequency signals.
FAQs
Q: How do I change the I2C address of the ADS1015?
A: The I2C address can be changed by connecting the ADDR pin to GND, VDD, SDA, or SCL, resulting in four possible addresses.
Q: Can the ADS1015 be used with a 3.3V system?
A: Yes, the ADS1015 can operate at voltages between 2.0V and 5.5V, making it compatible with both 3.3V and 5V systems.
Q: How can I increase the resolution of my measurements?
A: The ADS1015 is a 12-bit ADC, so the resolution is fixed. However, you can increase the effective resolution by using the programmable gain amplifier (PGA) to match the input signal range.
Q: What is the purpose of the ALERT pin?
A: The ALERT pin can be configured to act as a conversion ready signal or as an alert when the analog input exceeds a programmed threshold.
This documentation provides a comprehensive guide to using the Adafruit ADS1015 12-Bit I2C ADC with an Arduino UNO. For further information, consult the datasheet and additional resources provided by Adafruit.
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