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  1. M

    What is Radio board considering Silicon Labs BGM13P module?

    I am about to buy silabs BGM13P BLE module as given in this linkhttps://www.mouser.in/ProductDetail/Silicon-Labs/BGM13P22F512GA-V2R?qs=sGAEpiMZZMsGelYiB%252bjhZoug4L%2fWODSM7Fx4KdEhVtKbmv0yCxCjZA%3d%3d But while reading the information on Silabs website for this module I came across this Radio...
  2. M

    NRF24L01+ interrupting MCU only once.

    Hi, I am using NRF24L01+ as wireless communication medium. The NRF on PRX side interrupts MCU only once for recieved data. Although it sends ACK to NRF at PTX side. And I have also seen that this NRF at PRX side "discards" data recieved, by polling the registers. Same problem was faced by one...
  3. M

    [SOLVED] How current is limited in this charge controller?

    Hi, I am about to build this kind of PWM charge controller but using PIC MCU. But I am not getting how current is limited in this? In that instructable author says:"The amount of charging current is determined by difference between battery voltage and charge set point voltages". But how...
  4. M

    [SOLVED] How to copy a particular char from char string to a single char

    I am trying to work with PIC and GSM communication. In that as a notification after receieving SMS GSM sends string as:+CMTI: "SM",5. So I want to copy that '5' in a char. But though copying it the value in the char becomes garbage value and not '5'. Here is the code snippet: char SMSL; // this...
  5. M

    How to apply PWM signal to H-Bridge made of MOSFETS

    Hi, I am working on multilevel inverters using cascaded H-bridge topology. But I am confused on how to apply a PWM signal to H bridge for this application. As it is multilevel inverter so the signal voltage should increase step by step so PWM should be used. But I am confused that do I need to...
  6. M

    [SOLVED] SIM900A responding with ERROR

    Hi, I am working with SIM900A GSM module. I was testing it by sending ""AT\r\n" but it is responding by string ERROR. I am using PIC18F452. The same code was working well with SIM300 but SIM900A is responding with ERROR. And when used with PC it is working correctly it is giving correct OK...
  7. M

    [SOLVED] NRF24L01 CE and CSN pin loading PIC

    Hi, I am working on NRF24L01+(PA and LNA) version. But while experimenting with it I found that the CE and CSN pin of NRF is either loading PIC RC1 and RC2 pin. I am saying "loading" because when NRF is connected the output voltage of PIC RC1 pin(connected to CE of NRF) goes to 1.35V and same...
  8. M

    How to connect two TRIACs with each other to control common load

    Hello everyone, I am trying to connect two TRIACs to control common load as a incandescent lamp. I just want to switch it ON/OFF no dimming. I also tried connecting TRIAC like normal 2 switch connection but it damaged one TRIAC(it shorted and is always ON without gate) so how can we connect 2...
  9. M

    How AC voltage stabilizer works

    Hi one and all, I am studying AC voltage stabilizers and I have got good info on internet. but I didn't got any basic information regarding how a auto transformer tappings can be connected/disconnected to increase or decrease mains AC voltage. I have got a auto transformer with 3 tappings...
  10. M

    How to use commercial smoke detector within our circuits

    Hello, I am struggling to know how to interface the commercial smoke detectors used in fire alarm.I am not able to understand the logic of interfacing these detectors. I have one from system sensor model no-2351E named SMOKE DETECTOR-PHOTO. I am not able to find datasheet of this model but...
  11. M

    [SOLVED] how to calculate max current that a AC voltage stabiliser can supply?

    I have seen many voltage stabiliser circuits on internet I understood the Buck/Boost principle but I didn't understood how to calculate max current it can supply. I am confused whether the load is on mains or transformer?Please guide me.
  12. M

    [SOLVED] Measuring leakage current of mains using Current transformer

    Hello everyone, I am trying to measure leakage current using current transformer.I am using this circuit **broken link removed** And instead of LM324 I am using OP07. But when I try to leak current the transformer don't respond to any leakage. maybe my leaking curent method is wrong. Experts...
  13. M

    [SOLVED] Measuring mains frequency using PIC

    hello everyone I am trying to measure frequency using PIC16f886. I am using simple comparator for Sine wave to square wave conversion. And I have attached the input of comparator with RA4/T0CLK to use Timer0 as a counter.I have also copied code for it but my LCD displays counts from 0-9 and then...
  14. M

    [SOLVED] Measuring Current through CT

    Hello, I am trying to measure current from CT and I am able to measure current accurately above 1A but when measuring the current less than 1A then error occurs. I am using PIC16F886 with LCD 2x16. When current goes less than 1A suppose its 250mA then on display ideally it should be 0.25A but...
  15. M

    [SOLVED] LCD is not displaying anything

    Hi, I am trying to display Current and voltage values on LCD but its not working. I could see only "black squares" in first row.But if I remove any of the code part(current_read or voltage read) then LCD works!Here is my code: // LCD module connections sbit LCD_RS at RB7_bit; sbit LCD_EN at...
  16. M

    [SOLVED] Can we use WSH515 hall effect sensor for AC current measurement

    Hi everyone, I am trying to measure AC mains current. I have tried making current transformer for ac current measurement but it didn't worked! So I have turned to use this WSH315 hall effect sensor. So can we use it? if yes how? Any help would be appreciated. link for sensor...
  17. M

    [SOLVED] LCD showing random texts

    Hi all, I am using PIC16f628A and compiler is MikroC pro for PIC. I am actually making a project to test switching speed of electromechanical relay. Here is my code: //Relay switching speed test // LCD module connections sbit LCD_RS at RB2_bit; sbit LCD_EN at RB3_bit; sbit LCD_D4 at...
  18. M

    [SOLVED] PIC working in unusual way!

    Hi all! I am trying to make PIC to work,but its working in unusual way! I have used PICs many times and have a good experience on it, but from today, I am not able to make PIC to work as usual. The problem I am facing is, I am actually developing water level controller using PIC16F628A and I...
  19. M

    LED working in unusual way!

    Hi everyone I have faced unusual problem of LED and I'm curious regarding solution for it. Problem is: I have used ULN2003 for driving relays, and interfaced the LED's cathode on the outputs of ULN2003 and provided +5V via 1K resistor to anode of LED, but LEDs exhibited some unusual voltage on...
  20. M

    [SOLVED] Problem in reading string from UART

    Hi everyone, I am reading a string as response from SIM 300 GSM module. The string transmitted by GSM module is "RING" so I am using UART1_Read_text library function.I am using PIC16F628A and I am able to send SMS, dial calls etc,but as a beginner in serial communication I am unable to read/...

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