RF Remote Control Blog

Tang was looking for wireless remote control to switch his three led light strips. one button of remote turns on one red light; another button turns off that red light and turns on two green lights at the same time. The working voltage of led light is 12v dc. According to his requirements, a dc power 2-channel receiver with latching mode and 2-button remote controller are suitable for him.  Picture from http://www.carymart.com Simple wiring diagram is as follows: Channel 1 is for red light. Channel 2 is for two green lights. When button 1 of remote turns on the red light, two green lights are off. When button 2 turns on two green lights, the red light is off. Online shop:  http://www.carymart.com/

This is an pir infrared movement sensor module , commonly used to detect human body movement. It has higher sensitivity and broader detective range than others. Once a person enters into the detective range, the output will be high level. While the person goes out of the detective range, it will prolong automatically 20 seconds of retention time then the high level output will shift to the low level output. This device requires a 5-9V signal to operate. Typical applications are for automatically controlling lights, and taking snapshots of pests or wild animals. Widely applied for movement detection, automatic control, proximity switch, electronic theft prevention, safety protection, remote control measurement, etc. Features: Repeated triggering method Broad working voltage, low power consumption High level signal output, easy to be butt jointed with different types of circuits Retention time is adjustable Working voltage is adjustable Specification: Operating temper

Generally there are three working modes for rf remote controls: toggle, momentary, latched. Toggle mode is used most often. Controlling lamp, for example, press the button of remote, turn on the lamp; press the button again, turn off the lamp. Momentary mode can be set to control rolling blind or rolling door. Press and hold the button of remote, open the blind or door; release the button, close the blind or door. Both toggle and momentary mode are motivated by single relay, which means you can work these two modes with single button remote. As regards the latched mode, it is motivated by relay group. For relay group, only one relay will be on at a time, e.g. press remote button A, relay A will be on, and relay B will be off; press remote button B, relay B will be on, and relay A will be off. To be more specific, when you control the lamp by latched mode, you should prepare at least two buttons remote. Press button A, the lamp is on; press button B, the lamp is off. Online s

One-transmitter-to-many-receivers system means you can use one remote control (transmitter) to switch two or more receivers. It is often used for controlling two or more electrical devices in different places by one remote. Look at the following example. David has a big square bunch of trees. He wants to buy 6 12VDC receivers and place 1 receiver connected to 1 amplifier and 1 hunting speaker in every corner of the trees. Then he will stay in the blind and operate them with the remote control. Remote distance should be 100m. So David needs one remote with 12 buttons and six 2-channel receivers. Three choices for working mode: toggle, momentary or latching. If he chooses toggle mode, he can do like this: Press button 1 on remote, switch on channel 1 of receiver 1 Press button 1 again, switch off channel 1 of receiver 1 Press button 2 on remote, switch on channel 2 of receiver 1 Press button 2 again, switch off channel 2 of receiver 1 Press button 3 on remote, switch on chann