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1answer
50 views

Switching 12v pilot with 3.3v logic

I have an entry gate pilot operating on 12v. I would like to connect it to my esp8266 (3.3v) to control it over the WiFi. I would like to use 12v power line which I already have. The components which ...
1
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1answer
67 views

Logic level converter for NodeMCU (ESP8266): Input 24V/16V (Hi/Lo), 500 Baud

I want to use a digital input pin of a NodeMCU board (ESP8266) to read a digital signal. The signal line idles at 24V DC. The logic levels are 24V and 16V. The signal speed is 500 Baud (each signal ...
0
votes
1answer
56 views

The simplest “adaptive” downward level shift solution?

I want to build a level shifter circuit for the RX pin of my ESP-12S. The goal is to convert any level between 3.3V and 5V to 3.3V as I might use many USB to UART breakout boards with different output ...
0
votes
2answers
103 views

Help needed in understanding MOSFET datasheet

I am trying to find a logic level MOSFET for 3.3V operation. In my case, I am trying to compare AOD510 & AO4402. AOD510: \$\mathrm{R_{DS(on)}}\$ @ 4.5 \$\mathrm{V_{GS}}\$ = 0.004 ohm but has no ...
1
vote
1answer
972 views

ESP32 logic HIGH/LOW level voltage, not working?

From ESP32 datasheet: In my case: VDD = 3.3V Vil (max) = 0.25 * 3.3 = 0.825V Vih (min) = 0.75 * 3.3 = 2.475V Theoretically: LOW LEVEL range is -0.3V to 0.825V HIGH LEVEL range is 2.475V to 3.6V ...
0
votes
2answers
273 views

logic level converter does not get to 5v

I'm trying to control a 2 relay module with an Esp8266 esp 12-f. After a while, I realized that the GPIO from the ESP8266 was not going to drive the 5v needed for the relay to be activated. I only ...
-2
votes
1answer
57 views

Logic-level MOSFET not varying drain voltage [closed]

I have a series of FQP30N06L logic-level MOSFETs connected to a 3.3V logic controller. I am feeding the MOSFETs a PWM signal in order to vary the drain voltage, however, I am only experiencing a ...
0
votes
0answers
47 views

ESP8266 + Logic inverter on Tx = Failure to boot ?

I'm programming an ESP-12E module using the Arduino support package. My setup requires a logic level inverter on the Tx pin (only). I built the following which is working OK : simulate this ...
0
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2answers
780 views

Help with level shifting and ledstrip

I try to power a WS8211 based ledstrip. I first achieved to make it work with an Arduino UNO. The ledstrip needs to be fed with 12V power. Here is the working schematic : Once I apply power every ...
1
vote
2answers
2k views

5V to 3.3V logic level converter

I am trying to connect an ESP8266 module to an Arduino. Giving the fact that ESP8266 runs at 3.3V and the Arduino at 5V i need a logic level converter from 5V to 3V3. Is there a way i can build one ...
0
votes
3answers
282 views

Reverse signal protection for two devices with different voltage levels

I want to design a circuit that is capable of blocking reverse voltage signals but allowing forward voltage signals to pass through. The original problem and solution: I was designing an Arduino to ...
1
vote
2answers
1k views

How to use a logic level shifter for 1602 LCD

please bear with me as I am very new to electronics. I am trying to connect a NodeMCU dev kit (ESP8266) with a 1602LCD. I am using an i2c converter to interface with the LCD. The LCD requires 5V. I ...