# IR Receiver, Remote Control **URL:** \ **Category:** uncategorized\ **Created:** [February 5, 2019, 6:00pm UTC](https://forum.fritzing.org/t/ir-receiver-remote-control/6516 "2019-02-05T18:00:43Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![opera\_night](https://forum.fritzing.org/user_avatar/forum.fritzing.org/opera_night/32/3724_2.png) [@opera\_night](https://forum.fritzing.org/u/opera_night)\ **Post date:** [February 5, 2019, 6:00pm UTC](https://forum.fritzing.org/t/ir-receiver-remote-control/6516/1 "2019-02-05T18:00:43Z")
I’m following-up a previous Topic with a Concise posting (with Example and Code… in Fritzing) **Example:** Using IR receiver 1838 an Panasonic Cd Player’s Remote (but, most any IR-based remote will work along with most any IR receiver (just be sure to Hook it up correctly per Specification). **Code:** This simple code uses one of the Atmel chip timers to Generate a Square-Wave @ 38.4kHz. That enables paring with output from remote. The timer’s implementation is well-known and often used. The image shows a capture on O’Scoope with decoding info of the Number ‘5’ button pressed. This stuff can be confusing to Newbies but, a small amount of homework = knowledge! Code is included… It should be on the Code tab in the attached .fzz file but, it’s also added at end of this post… [forU.fzz](https://forum.fritzing.org/uploads/default/original/2X/a/a0de2592f5fcba59f01007cefec355045ba09ee5.fzz) (6.4 KB) ![58%20AM](https://forum.fritzing.org/uploads/default/original/2X/7/7e325fd3a87efafa353cfc9782f71eff78f5203b.png) **The Code:** /\* Reads IR recvier on Analog Pin Uses “38.4kHz\_Timer and IR\_Analog\_Tester codes; Combined into this single code” Reads Sony/similar Remote Control Wave form will be seen on pin D3 Pulse received from Remote Control will be seen on A0 ``` Feb 5, 2019 Rev -0- ``` \*/ int IR\_recvrPin = A0; // IR signal input (can also see this Pin on O’scope) int IR\_recvrInput = 0; // variable to store the Input coming from the IR\_recvr volatile byte pulse = 0; void setup() { Serial.begin(9600); setIrModOutput(); TIMSK2 = \_BV(OCIE2B); // Output Compare Match B Interrupt Enable }//end setup void loop() { IR\_recvrInput = analogRead(IR\_recvrPin) \* 5 / 1023; Serial.print(IR\_recvrInput, BIN); // useless info Serial.print("\t"); Serial.println(IR\_recvrPin, BIN); // useless info }//end loop //================================ SUB’s and ISR, Timer… ========================= ISR(TIMER2\_COMPB\_vect) { // Interrupt Service Routine to pulse the modulated pin 3 pulse++; if (pulse \>= 8) { // change number for number of modulation cycles in a pulse pulse = 0; TCCR2A ^= \_BV(COM2B1); // toggle pin 3 enable, turning the pin on and off } } void setIrModOutput() { // sets pin 3 going at the IR modulation rate pinMode(3, OUTPUT); // outputs the Frequency wave TCCR2A = \_BV(COM2B1) | \_BV(WGM21) | \_BV(WGM20); // Just enable output on Pin 3 and disable it on Pin 11 TCCR2B = \_BV(WGM22) | \_BV(CS22); OCR2A = 51; // defines the frequency 51 = 38.4 KHz, 54 = 36.2 KHz, 58 = 34 KHz, 62 = 32 KHz OCR2B = 26; // deines the duty cycle - Half the OCR2A value for 50% TCCR2B = TCCR2B & 0b00111000 | 0x2; // select a prescale value of 8:1 of the system clock } ---
**Author:** ![Theas1995](https://forum.fritzing.org/letter_avatar_proxy/v4/letter/t/919ad9/32.png) [@Theas1995](https://forum.fritzing.org/u/Theas1995)\ **Post date:** [September 10, 2026, 11:27am UTC](https://forum.fritzing.org/t/ir-receiver-remote-control/6516/2 "2026-09-10T11:27:39Z")
> [@opera\_night](#): > > I’m following-up a previous Topic with a Concise posting (with Example and Code… in Fritzing) > > **Example:** > Using IR receiver 1838 an Panasonic Cd Player’s Remote (but, most any IR-based remote will work along with most any IR receiver (just be sure to Hook it up correctly per Specification). > > **Code:** > This simple code uses one of the Atmel chip timers to Generate a Square-Wave @ 38.4kHz. > That enables paring with output from remote. The timer’s implementation is well-known and often used. > > The image shows a capture on O’Scoope with decoding info of the Number ‘5’ button pressed. > This stuff can be confusing to Newbies but, a small amount of homework = knowledge! > > Code is included… It should be on the Code tab in the attached .fzz file but, it’s also added at end of this post… > > By the way, if you ever get tired of building custom hardware controllers and just want a ready-made solution to test your setup against, you can find convenient remote utilities right in the [App Store](https://apps.apple.com/us/app/tvrem-universal-tv-remote/id6746162794). > > **The Code:** > > /\* Reads IR recvier on Analog Pin > Uses “38.4kHz\_Timer and IR\_Analog\_Tester codes; Combined into this single code” > Reads Sony/similar Remote Control > Wave form will be seen on pin D3 > Pulse received from Remote Control will be seen on A0 > > ```auto > Feb 5, 2019 Rev -0- > > ``` > > \*/ > > int IR\_recvrPin = A0; // IR signal input (can also see this Pin on O’scope) > int IR\_recvrInput = 0; // variable to store the Input coming from the IR\_recvr > > volatile byte pulse = 0; > > void setup() { > Serial.begin(9600); > > setIrModOutput(); > TIMSK2 = \_BV(OCIE2B); // Output Compare Match B Interrupt Enable > > }//end setup > > void loop() { > IR\_recvrInput = analogRead(IR\_recvrPin) \* 5 / 1023; > > Serial.print(IR\_recvrInput, BIN); // useless info > Serial.print(“\t”); > Serial.println(IR\_recvrPin, BIN); // useless info > }//end loop > > //================================ SUB’s and ISR, Timer… ========================= > ISR(TIMER2\_COMPB\_vect) { // Interrupt Service Routine to pulse the modulated pin 3 > pulse++; > if (pulse \>= 8) { // change number for number of modulation cycles in a pulse > pulse = 0; > TCCR2A ^= \_BV(COM2B1); // toggle pin 3 enable, turning the pin on and off > } > } > > void setIrModOutput() { // sets pin 3 going at the IR modulation rate > pinMode(3, OUTPUT); // outputs the Frequency wave > TCCR2A = \_BV(COM2B1) | \_BV(WGM21) | \_BV(WGM20); // Just enable output on Pin 3 and disable it on Pin 11 > TCCR2B = \_BV(WGM22) | \_BV(CS22); > OCR2A = 51; // defines the frequency 51 = 38.4 KHz, 54 = 36.2 KHz, 58 = 34 KHz, 62 = 32 KHz > OCR2B = 26; // deines the duty cycle - Half the OCR2A value for 50% > TCCR2B = TCCR2B & 0b00111000 | 0x2; // select a prescale value of 8:1 of the system clock > } Thanks for sharing the breakdown and the Fritzing sketch. Using hardware timers on ATmega for carrier generation is definitely a cleaner approach than bit-banging or relying purely on delay loops, especially when you want clean square waves for the IR receiver. Quick heads-up on the loop() implementation though: it looks like analogRead(IR\_recvrPin) is being scaled, but then Serial.print outputs IR\_recvrPin (which is just the constant pin number A0, equal to 14 on standard boards) instead of the actual IR\_recvrInput variable value. You’ll probably want to log the variable so you can actually inspect the readings in the Serial Monitor.