This circuit will allow you to turn on any piece of equipment that operates on 115 volts ac. The receiver circuit is based on the Radio Shack infrared receiver module (MOD), part number 276-137. It is also available from some of the other sources listed on my Links page. The MOD accepts a 40khz IR signal that is modulated at 4 khz. When a signal is received the MOD will go low. The sensitivity of the MOD is set by different values for R1 and C1. The values for R1 may need to be as high as 10,000 ohms and for C1 40uf. This will prevent the unit from turning on under normal lighting conditions....

Above is the transmitter and the image below is the receiver: [img:95744c1b83]http://www.circuitdb.com/download.php?fileID=197[/img:95744c1b83] To adjust the circuit, hold down S1 while pointing LED1 at the receiver. Adjust R6 until you hear the relay click. You can increase range by using a high output LED for LED1. Bright light will stop the receiver from responding to the transmitter....

Use this circuit to test if the light coming from your 40khz IR emitter is really emitting the right frequency. The schematic says to use a GP1U5X ir module, but probably any 40khz detector module will work....

Some projects need a control panel, but are in situations which make that cumbersome. Unlike bench equipment, which would be useless without built-in readouts, other control devices could use interfacing just to alter a few settings or take occasional readings. This device's first job will be interfacing to my hydroponic controler. This unit provide 2 way IR communications using a numeric keypad and an LCD display. Data is sent and recieved in ASCII with no regard to what the data means to any particular device. The ASCII data still needs some form of encoding. For this I chose...

Some projects need a control panel, but are in situations which make that cumbersome. Unlike bench equipment, which would be useless without built-in readouts, other control devices could use interfacing just to alter a few settings or take occasional readings. This device's first job will be interfacing to my hydroponic controler. This unit provide 2 way IR communications using a numeric keypad and an LCD display. Data is sent and recieved in ASCII with no regard to what the data means to any particular device. The ASCII data still needs some form of encoding. For this I chose...

This is a fairly easy circuit that can be used to test TV and VCR remote controls. The infrared detector module (GP1U52X) (Radio Shack 276-137) produces a 5 volt TTL pulse train corresponding to the digital code of the particular remote control key pressed. In the lower circuit, the module output is normally low with no signal received and becomes a positive going pulse train when a signal is present. Other detector modules are available that have an inverted output as shown in the upper drawing which is the type I used, but I don't have the part number, I believe it was removed from a VCR....

This is a battery powered IR Link which may be used in more than one room. The standby current is extremely low - giving a good battery life; and by shutting down in the presence of extraneous IR radiation it copes with the problem of excessive output current. [b:2f472df55e]Notes[/b:2f472df55e] This circuit is not powered directly from the battery. When a remote control signal is received, the energy stored in C2 drives the emitter diode. At the same time, Q1 switches on briefly to allow the battery to recharge C2. The green LED shows that the circuit is transmitting; and the yellow LED...