How to desgin the (pull-up or pull-down) resistor on a two CPUs system?
Hi all, I study a two CPU system. There is some control signals from CPU -> CPLD -> BMC (AST2500). The input voltage of both CPU to CPLD and CPLD to BMC is 3.3V and the same signal (secure boot...
View ArticlePIC16F877A DS18B20 multiple sensors connection
Hello. I have a problem with connecting N number of DS18B20 sensors on pic16f877 microcontroller on same pin in proteus simulation. I got it working with one sensor. But I cant get it working with...
View ArticleUsing a STM32F4 Discovery board to send PWM signal to industrial AC servo...
Hi All, I'm trying to interface the STM32F4 Discovery board with an AC Servo drive (Hiwin D2 Drive + Mige 130ST-M10010 AC servo motor). Here is the link to the servo drive manual...
View ArticleRemote control by location (PIC in Oshonsoft)
I'm making a couple of PCBs BASE/TRANSMITTER and REMOTE/MODEL RECEIVER using surface mount components, and PICs, for use as remote control by location (3D). Remote control by location, is when a...
View ArticleVoltage spike in ESP32 output?
I recently created a home wi-fi automation using ESP32 in which it include lots of Relays (coiled and SSRs). And due to power consumption and heating of power adapters, I added a main switch that would...
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Arduino Nano zero crossing detection
Hello, I built the circuit from this instructable: https://www.instructables.com/id/DIY-Arduino-Soldering-Station/ . I modified the schematic a bit, and it looks like this: In the schematic, I...
View ArticlePull-up resistors
I need ISP program of Winbond W25Q32BV chip (without removing it from board): as noted in Manual, the WP and HOLD pins must be pulled up to high with resistor: so its need be connected to VCC pin of...
View ArticleCan someone help me review this schematic? (AT89C52)
I am a beginner and I have got few questions with the first project I am attempting. I am trying to build a reliable timer circuit with three timing options. The use case is very similar to a microwave...
View ArticleWiFi ESP motor controller small size
Hi I need a recommendation for an ESP that is very small in size like the ESP-01f (about 10mm x 11mm) , are these still available and where. Want something that will run a 12 volt dc motor up to 1 amp,...
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How To Store Multiple Keys in Arrays?
Hi all, I'm new to microcontroller programming. I would like to ask how do I display multiple keys on my LCD display. An example is I want to show "123456". Below is the codes I'm using. I am using...
View ArticleAm I GUARANTEED not to ruin arduino circuit if I use this trick???????
Hello I have an arduino uno which outputs 5 volts and recommends a maximum current of 20mA If I use a 250ohm resistor in series with any circuit am I GUARANTEED not to blow the arduino uno because V =...
View ArticleHow to extract code from Arduino
Hello all, by now some of you have seen my previous threads and noticed I haven't uploaded anything, or rather I uploaded too much in a set time period. All that was due to my project being a...
View ArticleRS-485 vs Ethernet for a large automation system network
I am working on a automation system where 1 raspberry pi is running a server and a database. I need this raspberry PI to communicate to multiple slave devices (such as arduino UNO or NANO or other...
View ArticleHelp with transistor based On/Off (reset attiny) circuit
Hi, I am trying to bring the reset to 0v on my attiny2313 (happened to have that one available for use) Heres the reason, I got a PIR that only switches on (high) for 2 seconds. What I am trying to...
View ArticleHow to write data to SPI slave device in MCP23S17 IC?
Hello, I am working on SPI MCP23S17 16bit I/O expander IC,as a output mode, to turn on LED's. Need to know how to write data to this IC bit by bit,How many byte cycle need to run to glow all the LED ON...
View ArticleADC AD7921
C: SPISettings SPI_Settings_Test_14(5000000, MSBFIRST, SPI_MODE3); void setup() { Serial.begin(115200); } void loop() { // SPI ACTIVED SPI.begin(); // BUS SPI ACTIVED...
View ArticleNeed help Arduino dc motor
Hi guys , I need your help How to build a diagram & Arduino program to control a DC motor (9v I think) datasheet required & The program from the Arduino to Run the motor for 3 second...
View ArticleESP32-PICOD4 custom board flashing
Hello all, I recently got a custom PCB made with ESP32-PICO-D4 as the MCU. I only have the following pins exposed outside for connecting wires Rx, Tx, VCC, GND, IO 0(GPIO zero), and EN pins. I wanna...
View ArticleHow to design a arduino compatible custom PCB using ATmega808 or ATmega1608?
Hey all, I need to design a custom pcb with Arduino compatibility. Since I will be designing this PCB from scratch, I thought of going with lesser priced AVR's ATmega808 or ATmega1608 which perfectly...
View ArticleCommunication between RPI Zero & Arduino Nano
Hello , I am asking before i will start to work on my project. I need to use little Camera and OpenCv to detect simple obstacles , and as a results to navigate robot. I thought to use RPI Zero for...
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