IR receiver module not giving desired input - Electronic Circuits Projects Diagrams Free

ahkumm · 14th March 2003, 03:42 PM

I hav this IR receiver module, IRM-8601s, according to the datasheet, I should get a high of 4.5v and above when there is IR detected and 0.2v when there is not any IR received, however, wat I got was 0.2V and 1.2V.
I need it to be more digital as an input to the microcontroller.
Help?

**kinjalgp** · 14th March 2003, 04:04 PM

Most IR sensors require strong external pull-up resistor of around 2.2k. Have you connected it?

ahkumm · 15th March 2003, 11:27 AM

Pull up resistors? Wat do u mean? where should it be connected?

bogdanfirst · 15th March 2003, 02:55 PM

between the output and the +Vcc
the pull down resistor: between output and Gnd

**kinjalgp** · 15th March 2003, 04:44 PM

If you have any trouble, look at this schematic.

**kinjalgp** · 15th March 2003, 04:49 PM

The other reason of low output voltage may be that your sensor is meant for sensing carrier frequency slightly different than what you are transmitting through your remote. Like for example consider a sensor TSOP1738 and TSOP1740 from Vishay Telefunken. Both these sensors are for remote control but one detects 38KHz carrier whereas the other detects 40KHz. So make sure your remote sends signals at same freq. which comes in sensors bandwidth.

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14th March 2003, 03:42 PM	(permalink)
ahkumm	IR receiver module not giving desired input I hav this IR receiver module, IRM-8601s, according to the datasheet, I should get a high of 4.5v and above when there is IR detected and 0.2v when there is not any IR received, however, wat I got was 0.2V and 1.2V. I need it to be more digital as an input to the microcontroller. Help? __________________ Desperately in need!

14th March 2003, 04:04 PM	(permalink)
kinjalgp	Most IR sensors require strong external pull-up resistor of around 2.2k. Have you connected it? __________________ "There is no way to peace, peace is the way!"

15th March 2003, 11:27 AM	(permalink)
ahkumm	Pull up resistors? Pull up resistors? Wat do u mean? where should it be connected? __________________ Desperately in need!

15th March 2003, 02:55 PM	(permalink)
bogdanfirst	between the output and the +Vcc the pull down resistor: between output and Gnd

15th March 2003, 04:49 PM	(permalink)
kinjalgp	The other reason of low output voltage may be that your sensor is meant for sensing carrier frequency slightly different than what you are transmitting through your remote. Like for example consider a sensor TSOP1738 and TSOP1740 from Vishay Telefunken. Both these sensors are for remote control but one detects 38KHz carrier whereas the other detects 40KHz. So make sure your remote sends signals at same freq. which comes in sensors bandwidth. __________________ "There is no way to peace, peace is the way!"