All Questions
Tagged with logic-level esp8266
16
questions
0
votes
0
answers
111
views
Connecting a ESP8266 GPIO Input to a 4.2V
I am following this great article on building a low power sensor using ESP8266. The author (Gadjet) connects the GPIO12 pin to a LIPO through a 10K resistor. I am not sure if this a great way to do, ...
- 183
3
votes
4
answers
2k
views
Unidirectional level shifter 1.8-5V -> 3.3V
I'm looking for a circuit/IC to shift logic levels between 1.8/3.3/5V and 3.3V.
This is to connect various devices via UART to the ESP8266. As such, I only need unidirectional translation - the ...
- 33
4
votes
3
answers
8k
views
Logic Level Shifter 24/12 V to 3.3 V
I have a ESP32 and Industrial Sensor with voltage output 0-12 V and 0-24 V. How can I interface 2 logic levels with my 3.3 V ESP32? Can I use a BSS138 or do I need another module?
- 41
-1
votes
2
answers
3k
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How to do serial communication between 3.3V and 5V devices using THT components?
I know that there are many questions dealing with logic level conversion/shifting between 3.3V and 5V devices, but my goal is to do do this with standard breadboard parts, so either discrete parts or ...
0
votes
1
answer
2k
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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 ...
- 101
1
vote
1
answer
1k
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 ...
- 193
0
votes
1
answer
229
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 ...
- 101
0
votes
2
answers
146
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 ...
- 2,162
8
votes
3
answers
21k
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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
2
answers
796
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
1
answer
61
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 ...
- 115
0
votes
2
answers
774
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 ...
- 116
0
votes
2
answers
3k
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 ...
- 121
3
votes
2
answers
3k
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 ...
- 43
0
votes
3
answers
445
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 ...
- 161