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 Water Level Sensor 1/2Npt with 0-12VDC, from ProK.

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

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

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

The Atlas Scientific pH circuit designs currently available on the Internet are outdated and use a significant number of overly complex analog components. Atlas Scientific has reinvented and refined the pH circuit of the past to a more modern and simple to use model.

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.

Converter of Level Logic 3.3V and 5V 8 Channels.

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

This package includes a Sensor of Level of Water and a Sensor of Humidity from Solo. If the plates have water covering the sensor components, an analog value will be available on the "SIG" connection. The Sensor of Level of Water can detect up to 4cm of water. This way, you can check if your aquarium, or your pet's water bowl, still has enough water. You can use the Sensor of Moisture of the Soil to check your plant's soil or growing environment, for example.

A Water Flow Meter Sensor 6mm Hose designed for your Drinking Water Machine!

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