OpenSmart ASK Receiver

Questionable RF Receiver For *ASK* Modulation With PCB Antenna

The company OpenSmart released this ASK receiver with an unmarked receiver chip and poor documentation.

The receiver is sold as a kit together with a sender board and is available in separate versions for 315MHz (US) and 433MHz (Europe).

The actual receiver is located on a separate and much smaller board that is soldered onto a bigger bpard which only purpose apparently is to provide a PCB antenna.

While PCB antennas certainly are convenient and compact, they are not efficient, limiting the distance that can be reached. During build time and testing, make sure you do not touch the antenna or hold the breakout board in a way that covers the antenna.

The way how the receiver board is piggy-backed into a relatively huge antenna board makes this solution the most clumsy of all reviewed.

Apparently, the company OpenSmart uses these modules in various combinations together with other boards to make them wirelessly controllable. For example, OpenSmart also sells wireless joystick and sensor boards that use the same fundamental sender and receiver boards.

The company OpenSmart advertises this board as “Long-Range Receiver” and even as “LORA Board”. This board is neither able to receive RF signals over long distances nor does it implement LoRa modulation. It is simply a cheap and very simple ASK receiver.

The RF frequency of the board on is printed on the front side. The 433MHz version uses blue boards, and the 315MHz version uses red boards.

Technical Data

Item Value
Voltage 2.0-5.5V
Frequency 433MHz or 315MHz
Working Current 2mA
Modulation Mode AM (OOK)
Transmission Rate 2 Kbps
Sensitivity -110dBm
Transmission Distance <50m at 5V
Size 24x30x7mm

Pins

The board comes with three pins.

Pin Tag Description
1 SIG Data In
2 VCC 5V
3 GND negative pole

Library

The vendor suggests to use the VirtualWire software library.

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(content created Apr 18, 2024)