# Logic Level not pushing 3.3v **URL:** \ **Category:** General Electronics\ **Created:** [November 29, 2019, 7:33am UTC](https://forum.arduino.cc/t/logic-level-not-pushing-3-3v/623305 "2019-11-29T07:33:48Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![cr0n\_dist0rti0n](https://avatars.discourse-cdn.com/v4/letter/c/4bbf92/32.png) [@cr0n\_dist0rti0n](https://forum.arduino.cc/u/cr0n_dist0rti0n)\ **Post date:** [November 29, 2019, 7:33am UTC](https://forum.arduino.cc/t/logic-level-not-pushing-3-3v/623305/1 "2019-11-29T07:33:48Z")
I am using an Arduino to control my RaspberryPi. I want to send a high and low signal from pin 2 on my Arduino to pin 12 on my Raspberry Pi. Based on that high signal my raspberry pi would run a python program. Since Arduino is a 5v system and raspberry pi is a 3.3v system I got a logic level to transfer the high/low signal between the two boards. I’ve set it up as follows: 9v —\> Arduino VIN Arduino 5v —\> Hv Arduino GND —\> GND Arduino 3.3v —\> Lv Arduino GND —\> GND Arduino Pin2 —\> H1 RaspberryPi Pin12 —\> L1 In order to test the Arduino and setup I programmed the Arduino to pull up and down the pin every 3 seconds. I did a voltage test on Pin2 and it pulled up at 5v and down to just over 1v; however, when I do a voltage test on L1 it never really gets above about 0.55v and it never really goes below 0.53v. Regardless it’s a long way from 3.3v. I’ve looked up everything and check a ton of times. It looks like I have everything connected correctly so I’m at a loss. I bought a couple logic levels so I tried a different one with exactly the same results. Clearly I’m missing something but I’m at a loss as to what that is. I’ve never used a logic level before. Thanks for any guidance people can suggest. ---
**Author:** ![JCA34F](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/jca34f/32/340148_2.png) [@JCA34F](https://forum.arduino.cc/u/JCA34F)\ **Post date:** [November 29, 2019, 7:54am UTC](https://forum.arduino.cc/t/logic-level-not-pushing-3-3v/623305/2 "2019-11-29T07:54:42Z")
You didn't say WHICH level shifter but I believe this should work: 9v --\> Arduino VIN Arduino 5v --\> Hv Arduino GND --\> GND Pi 3.3v --\> Lv Pi GND --\> GND Arduino Pin2 --\> H1 RaspberryPi Pin12 --\> L1 ---
**Author:** ![cr0n\_dist0rti0n](https://avatars.discourse-cdn.com/v4/letter/c/4bbf92/32.png) [@cr0n\_dist0rti0n](https://forum.arduino.cc/u/cr0n_dist0rti0n)\ **Post date:** [November 29, 2019, 9:06am UTC](https://forum.arduino.cc/t/logic-level-not-pushing-3-3v/623305/3 "2019-11-29T09:06:56Z")
Logic Level Used: > **[SparkFun Logic Level Converter - Bi-Directional - BOB-12009 - SparkFun...](https://www.sparkfun.com/products/12009)** > > The SparkFun bi-directional logic level converter is a small device that safely steps down 5V signals to 3.3V AND steps up 3.3V to 5V at the same time. ---
**Author:** ![TomGeorge](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/tomgeorge/32/215261_2.png) [@TomGeorge](https://forum.arduino.cc/u/TomGeorge)\ **Post date:** [November 29, 2019, 12:05pm UTC](https://forum.arduino.cc/t/logic-level-not-pushing-3-3v/623305/4 "2019-11-29T12:05:57Z")
Hi, Welcome to the forum. Please read the first post in any forum entitled how to use this forum. [http://forum.arduino.cc/index.php/topic,148850.0.html](http://forum.arduino.cc/index.php/topic,148850.0.html) . You do have gnd of the Arduino and the Pi connected together? Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png? Thanks Tom... 🙂 ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [May 6, 2021, 2:28am UTC](https://forum.arduino.cc/t/logic-level-not-pushing-3-3v/623305/5 "2021-05-06T02:28:34Z")
Closed on May 6, 2021, 2:28am UTC