# MTPD1346D-030 does not work with arduino **URL:** \ **Category:** Sensors Transducers\ **Tags:** sensors-transducers, automation-and-control, marktech-optoelectronics, arduino, associated-products\ **Created:** [July 25, 2022, 3:38pm UTC](https://forum.digikey.com/t/mtpd1346d-030-does-not-work-with-arduino/24137 "2022-07-25T15:38:27Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![fabriziochiummo](https://avatars.discourse-cdn.com/v4/letter/f/b3f665/32.png) [@fabriziochiummo](https://forum.digikey.com/u/fabriziochiummo)\ **Post date:** [July 25, 2022, 3:38pm UTC](https://forum.digikey.com/t/mtpd1346d-030-does-not-work-with-arduino/24137/1 "2022-07-25T15:38:27Z")
![Screenshot 2022-07-25 alle 17.28.25](https://global.discourse-cdn.com/digikey/original/3X/b/9/b9a12c361528af58a69f9fd6b37f0fcf52b1eaed.png) I tried the same circuit with the components: 1. TCRT1000 2. TSAL6200 emitter / 3004 M1 D photodiode and it works, but when i try with the components: MTE1300W emitter / MTPD1346D-030 photodiode it doesnt work, the photodiode gives random values about 4,5v even if the emitter is not connected. ---
**Author:** ![rick\_1976](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/rick_1976/32/1571_2.png) [@rick\_1976](https://forum.digikey.com/u/rick_1976)\ **Post date:** [July 25, 2022, 4:14pm UTC](https://forum.digikey.com/t/mtpd1346d-030-does-not-work-with-arduino/24137/2 "2022-07-25T16:14:48Z")
Greetings, Connecting the photodiode backwards seems like the most likely way one would obtain the results described. Check this connection carefully. Note that the connection of one of the three device leads to the metallic case may be useful as a reference. ---
**Author:** ![fabriziochiummo](https://avatars.discourse-cdn.com/v4/letter/f/b3f665/32.png) [@fabriziochiummo](https://forum.digikey.com/u/fabriziochiummo)\ **Post date:** [July 25, 2022, 4:19pm UTC](https://forum.digikey.com/t/mtpd1346d-030-does-not-work-with-arduino/24137/3 "2022-07-25T16:19:28Z")
> [@fabriziochiummo](#): > > MTPD1346D-030 ![Screenshot 2022-07-25 alle 18.16.57](https://global.discourse-cdn.com/digikey/original/3X/0/1/017dcc3c865c349c77383a3a2c9e0aa7a579a97e.jpeg) i connected: 3 to 5v power supply 2 to the ads, the resistance and then GND ---
**Author:** ![fabriziochiummo](https://avatars.discourse-cdn.com/v4/letter/f/b3f665/32.png) [@fabriziochiummo](https://forum.digikey.com/u/fabriziochiummo)\ **Post date:** [July 25, 2022, 4:30pm UTC](https://forum.digikey.com/t/mtpd1346d-030-does-not-work-with-arduino/24137/4 "2022-07-25T16:30:02Z")
I double-checked the connections I previously sent, do I also have to send a photo of my project? ---
**Author:** ![rick\_1976](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/rick_1976/32/1571_2.png) [@rick\_1976](https://forum.digikey.com/u/rick_1976)\ **Post date:** [July 25, 2022, 4:52pm UTC](https://forum.digikey.com/t/mtpd1346d-030-does-not-work-with-arduino/24137/5 "2022-07-25T16:52:24Z")
> [@fabriziochiummo](#): > > i connected: > 3 to 5v power supply > 2 to the ads, the resistance and then GND These connections would result in the diode being reversed from the direction shown in the original post. Note that the “arrow” in a diode symbol points toward the cathode terminal. ---
**Author:** ![fabriziochiummo](https://avatars.discourse-cdn.com/v4/letter/f/b3f665/32.png) [@fabriziochiummo](https://forum.digikey.com/u/fabriziochiummo)\ **Post date:** [July 25, 2022, 5:03pm UTC](https://forum.digikey.com/t/mtpd1346d-030-does-not-work-with-arduino/24137/6 "2022-07-25T17:03:28Z")
I did as you say, now it reacts and recognizes the transmitter from a minimum voltage of 0.3v to a maximum of 0.8v, but I expected a range between 3.2v and 4.68V ---
**Author:** ![rick\_1976](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/rick_1976/32/1571_2.png) [@rick\_1976](https://forum.digikey.com/u/rick_1976)\ **Post date:** [July 25, 2022, 7:04pm UTC](https://forum.digikey.com/t/mtpd1346d-030-does-not-work-with-arduino/24137/7 "2022-07-25T19:04:18Z")
The voltage measured at the output will be a function of current flow passed by the photo sensor in response to an optical signal, and will vary with the strength of the optical signal and the sensitivity of the device. Photodiodes like the MTPD1346D-030 generally provide lower sensitivity and faster response in comparison to phototransistors like that found in the TCRT1000. ---
**Author:** ![nayakatharva25](https://avatars.discourse-cdn.com/v4/letter/n/b19c9b/32.png) [@nayakatharva25](https://forum.digikey.com/u/nayakatharva25)\ **Post date:** [January 27, 2024, 12:45pm UTC](https://forum.digikey.com/t/mtpd1346d-030-does-not-work-with-arduino/24137/8 "2024-01-27T12:45:36Z")
Does this actually work. I have tried numerous circuits and designs and they don’t work as expected. Will be trying this as well… But have you got any output from this circuit?