A-Star 328PB Micro - 3.3V, 12MHz

The SparkFun Current Sensor Breakout is a High Precision Card that uses the ACS723 for Moderate AC and DC Current Detection Applications. The ACS723 Sensor uses a Hall Effect Sensor to Emit a Voltage relative to the Current that flows through the IP + and IP- Pins on the Board. The advantage of using a Hall Effect Sensor, specifically, is that the Circuit Being Detected and the Sensor Reading Circuit are Electrically Isolated, which means that although your Arduino is Operating at 5V, the Detected Circuit may be Operating at Higher DC or AC voltages.

A-Star 328PB Micro - 5V, 20MHz

Electronic Brick - Sensor de Corrente - Loop 4-20mA

Bi-directional Logic Level Converter 4-channel by I2C BSS138

This DTMF Shield is a Dual-tone multi-frequency signaling module decoder for Arduino With it's audio connector you can decode the crazy funny noises common phones make.

Do you make time to talk to your Arduino? Maybe you should! The EasyVR Shield 3.0 is a voice recognition shield for Arduino boards integrating an EasyVR module. It includes all of the features of the EasyVR module in a shield form factor that simplifies connection to the Arduino main board and PC.

This is a DC-DC buck-mode power module, with input voltage range of 3V - 15V and fixed voltage / current at fixed 5V / 600mA . Working frequency can reach 0.5 MHz . The module has high conversion rate and small size, easy to incorporate.

The Current Sensor 70A is a great option for those looking for equipment to measure current up to 70A and that is non-invasive.

Play your .mp3 files stored by USB or SD card. For Use (12V): Place a 68Ohm/1W Resistor in series with the (+) of the Power Supply, to avoid excessive dissipation.

The Grove - Speaker is a module consisting of power amplification and voice outputs. The volume can be adjusted by the integrated potentiometer . With input frequencies at different, the speaker generates different tones. Encoding the music in Arduino, make your own music box yourself!

The Vma449 integrates the Voice Recorder ISD1820 and Playback CI to record a single message up to 20 seconds long. The recorded message is stored in the analog flash memory that keeps the message stored even in the event of a power failure. The module has an integrated microphone to record your message and buttons for recording, partial playback or full reproduction of the message functions.

The Module KA2284 is a Battery, Power and Audio Level Indicator.

A small Audio Speaker that is ideal for radio and amplifier projects.

The purpose of this sensor is to measure the sound intensity of the surrounding environment.

This Voice Recognition Module with Microphone for Arduino can recognize up to 15 voice instructions and be suitable for most cases involving voice control. With this module, we can control cars or other electrical devices by voice.