The Adafruit ADS1115 is a high-precision, 16-bit Analog-to-Digital Converter (ADC) that operates on an I2C bus interface. It is designed to accurately convert analog signals to digital form, allowing microcontrollers and other digital systems to process real-world data such as temperature, pressure, or light intensity. The ADS1115 is particularly useful in applications requiring high-resolution measurements, such as data loggers, sensors, and precision instrumentation.
Explore Projects Built with Adafruit ADS1115 16Bit I2C ADC
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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.
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.
Power Connections: Connect VDD to a 2.0V to 5.5V power supply and GND to the system ground.
I2C Connections: Connect SCL and SDA to the corresponding I2C clock and data lines on your microcontroller. Use pull-up resistors as required by your I2C bus specifications.
Address Selection: Connect the ADDR pin to GND, VDD, SDA, or SCL to select one of the four possible I2C addresses.
Analog Inputs: Connect your analog signal to any of the A0 to A3 pins. For differential measurements, use pairs A0/A1 or A2/A3.
Programming with Arduino
To use the ADS1115 with an Arduino, you can utilize the Adafruit ADS1X15 library. Here's a basic example of how to read a single-ended voltage from channel A0:
#include <Wire.h>
#include <Adafruit_ADS1015.h>
Adafruit_ADS1115 ads; // Create an instance of the ADS1115
void setup() {
Serial.begin(9600);
ads.begin(); // Initialize the ADS1115
}
void loop() {
int16_t adc0; // Variable to hold the ADC result
adc0 = ads.readADC_SingleEnded(0); // Read from channel 0
Serial.print("AIN0: "); Serial.println(adc0);
delay(1000); // Wait for a second
}
Best Practices
Ensure that the input voltage does not exceed the selected full-scale range of the PGA.
Use decoupling capacitors close to the power pins to minimize noise.
Keep analog signal paths as short as possible to reduce noise pickup.
Avoid running analog signal lines parallel to high-current traces to prevent interference.
Troubleshooting and FAQs
Common Issues
No response from the device: Check the I2C connections, ensure pull-up resistors are installed, and verify that the correct I2C address is being used.
Inaccurate readings: Ensure that the input voltage is within the range set by the PGA. Check for noise in the analog signal and power supply lines.
FAQs
Q: Can the ADS1115 be used with a 3.3V system?
A: Yes, the ADS1115 can operate at voltages as low as 2.0V.
Q: How do I change the I2C address of the ADS1115?
A: The I2C address can be changed by connecting the ADDR pin to GND, VDD, SDA, or SCL.
Q: What is the maximum voltage that can be measured by the ADS1115?
A: The maximum voltage is determined by the PGA setting, which can be up to ±6.144V.
Q: How can I use the ALERT pin?
A: The ALERT pin can be configured for various functions such as a conversion ready signal or a threshold alert. Refer to the ADS1115 datasheet for detailed configuration options.
For further assistance, consult the ADS1115 datasheet and the Adafruit ADS1X15 library documentation.
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