![]() ![]() The speaker is then connected to the digital pins D9 and D10. The connections to the NRF module are same as the transmitter. The 3.3V output form the AMS1117-3.3 is used to power the NRF24L01. The 5V pi of the Arduino Nano is connected to the voltage regulator. The Arduino is powered by the onboard USB port. Here I have used an Arduino Nano, since it is much easier to use and the small size difference doesn’t matter. The below image shows the circuit diagram for the Arduino audio transmitter using nRF24L01. THE CE and CSN pins are connected to the digital pins D7 and D8 of Arduino. The NRF24L01 module is connected to the SPI pins of the Arduino. The output of the preamplifier is connected to the ADC0 pin of the Arduino. The preamplifier will amplify the weak signal from the microphone to an appropriate level. The microphone is connected to the input of the preamplifier built around LM358 op amp. The entire circuit is powered by the 3.3V output from this regulator. The output of the module is then connected to a 3.3V voltage regulator. The battery is connected to the TP4056 module, This module is responsible for charging and protecting the Li ion cell. You may also use other Arduino boards like Arduino Nano. The circuit is built around an Arduino pro mini. The complete circuit diagram for the Arduino Audio Spy Bug transmitter is shown below. ![]() ![]() Components Required to Build the Arduino Audio Spy BugĪll the parts you will require to build the Arduino Audio RF Transmitter and Receiver are listed below. We have previously explained PWM in detail and built basic Arduino PWM project. This PWM signals are then fed to a speaker to reproduce the audio. On the receiver side the received data is then processed and a corresponding PWM signal is generated at the Arduino GPIOs. Once the data is samples and converted to digital format, that data is then transmitted using the NRF24L01 module in real time. This amplified signal is then samples using the built in ADC of the Arduino. The picked-up sounds then amplified using a preamplifier built around an operational amplifier. We have used a condenser microphone to pick up the sounds. The working of the Arduino Audio Spy Bug is fairly simple. In this circuit, Arduino RF transmitter has the microphone to take the audio input, and at the other part it has Arduino RF Receiver which will receive the audio from transmitter and output it using Speaker. Regardless of the small size it provides reasonable sound quality as well as transmission range. The small size of the project makes it very versatile and useful. The transmitter circuit is battery powered and has the battery protection built in. With its small size and easy portability, this audio spy bug is a must-have for anyone in need of discreet and reliable audio recording. ![]() This device is perfect for monitoring a baby room, keeping an eye on a pet, or even for professional surveillance. The NRF24L01 module allows transmission over specific channel, ensuring that our transmissions remain private up to a level. This audio spy bug is highly customizable and can be easily integrated with other devices and systems. In this project, we are going to build an audio bug using Arduino and NRF24L01. ![]()
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