Attached picture shows my circuit. In it I use only one IR sensor (TSOP1738) but now I want to add another IR sensor (TSOP1738) to my circuit. So my questions are:
1. Is it possible?
2. How (parallel or series)?
Thanks.
Electronic – How to use 2 TSOP1738 (infrared sensor) in one circuit
infrared
Related Solutions
These sensors really put a lot of noise on the line. I'm using here a similar sensor (the GP2D120XJ00F). First, add another 100nF ceramic cap parallel to the existing 10µF cap. This helps to better damp the changes in current consumption of this sensor. Additionally, I added a low-pass filter to the output (10k resistor and 100nF capacitor), to smooth the output signal. (I then use an averaging filter in the MCU when reading the input, but then I don't have the need for really fast reaction times).
All you need to do is have a simple "bias" on the base of the transistors in your circuit. This would basically "pull them up" to have a higher average value; say 0.5 volts, and a capacitor to couple with the bias. So when the alternating waveform from one of your jacks goes say between +/-0.6v, the transistor would see +1.1 to -0.1v. The circuit would look like this:
simulate this circuit – Schematic created using CircuitLab
Best Answer
Yes, both are common emitter output and can share 1 pullup R.
But your supply voltage AC noise ought be < 1mV for best range. ok?
That means the LED may need a separate V+ path to source and ground path must not drop mV to avoid long range Rx noise during detection.
Add a low ESR bulk e-cap to Vcc,Gnd, 100uF?
But 100uF load wont work well on output as the cap will draw large currents. Ic=CdV/dt
You need a transistor on outputs to boost current or better CMOS 1 shot to buffer IR Rx then stretch pulse with diode, 1uF, 1Meg decay then output 330 to 1K from CMOS Inverter to LED.