The self-generating wireless remote control device is to convert the trace kinetic energy generated by pressing the switch or key by hand into electrical energy through the energy acquisition module to supply the controller to work, and then transmit the control signal through the radio frequency to control other equipment. At present, the energy acquisition conversion module mainly has two methods: micro generator (closing the wire to cut the magnetic induction line) and piezoelectric electricity generation (as shown below). The former generates more electricity, the cost is high, and the self-electric remote control switch is also more expensive, the latter generates less electricity and is very cheap, and the hardware structure and software design need more consideration.

The wireless remote control made in this way, especially the remote control switch, has obvious advantages in the smart home:

◆ Wiring, no chiseling wall, easy installation, save material labor cost;

◆ No battery, energy saving and environmental protection;

◆ No fixed position, freely placed or mounted within the signal range;

◆ Passive power supply, anti-shock, high safety level

  Self-powered wireless remote control device (switch/remote control) is a wireless transmission device that does not require battery or mains energy, reduces battery pollution and reduces wiring, and is easy to create a green and simple smart home system, helping to save energy and reduce emissions.

Smart toilet solution application & circuit block diagram

  For self-powered wireless remote control equipment, WAPU Micro launched the micro energy collection wireless transmitter chip CMT218x, CMT2119A, CMT215x, etc., together with the receiving chip CMT221x series, the wireless transmitter chip is more suitable for the application of fewer switches/buttons. Recently, CMT2189D has successfully discussed production landing in a smart toilet brand factory. Choose CMT2189D, CMT2119A, CMT2150A, etc., on the smart toilet simple self-electric remote control (kinetic energy switch); Function remote control function buttons, battery power, choose CMT2119B; One receiver needs to transmit to two receivers, and CMT2219B demodulation remote control signal can be selected to output to the main control board, as shown below:

  Microenergy harvesting wireless transmitter chip CMT2189D, low power SoC RF transmitter embedded with enhanced 1T-8051 core: This series of chips supports wireless transmitter functions of 27 ~ 960MHz, OOK modulation or (G)FSK modulation.

* High efficiency PA, output power adjustable range 0~+13dBm, +13dBm transmission only 18mA

* 8 kB OTP program storage and 12 kB ROM (for storing API libraries)

* With single-wire (1-WIRE) online simulation function, users can directly download the target debugging code to the on-chip PRAM through the dedicated 1-WIRE debugger, debugging is very convenient; Unlike traditional OTP chips, which cannot support online simulation, a specific emulator is required, and debugging is very troublesome

* Built-in AES-128 accelerator and true random number generator (TRNG), and provide 32-bit serial number (ID), * ideal for remote control or active RFID applications where transmitting information needs to be encrypted

* Support dual-clock running architecture, the system can run the internal high-speed clock at the same time, can use the internal low-power RC oscillation for low-power timing wake-up mode

* Built-in 12-bit high-precision high-speed SAR-ADC, suitable for wireless sensor acquisition applications

The main features of microenergy harvesting wireless transmitter chip CMT2119A:

No need for host software configuration parameters, simple and user-friendly operation, saving MCU configuration time

High order harmonic margin is sufficient, easily through Europe and the United States all kinds of safety certification

Different frequencies can be set by software, no need to replace the crystal, and fewer peripheral components

Frequency range: 240~480 | 240~ 960MHz, strong wall penetration ability

Modulation mode: (G)FSK | OOK, (G)FSK

Speed: 0.5 ~ 30Kbps(OOK)/0.5 ~ 100Kbps(FSK)

Output power: -10 ~ +13dBm, support software Settings

Low voltage: 1.8 ~ 3.6V

Working current: 15.5mA (+10dBm, 50% duty cycle9.6Kbps)

Small package: SOT23-6

More application scenarios

In addition to the smart toilet remote control, the remote control of the following application scenarios can be self-electric remote control, after access to the network close, you can expand more smart home use scenarios: wireless lighting, wireless doorbell, remote control shutter doors and Windows, remote control fans, smart sockets, etc.