Table tennis scoreboard – Can anyone can point me to a project of electronic table tennis scoreboard with external boards (two different colors) as well?  Read more

Refresh values in 16 x 2 LCD – In a 16×2 LCD, how do I refresh the values at point of cursor if the other values remains stable. For example, the LCD will display as follows.
Volt : 00 V
Current : 0.) A
In this example, 00 in first line and 0.0 in second line data only will vary by refreshing. Will the other string (data) be stable? Read more

PIC16f151x SPI problem in EEPROM – I want to interface with and EEPROM of a UHF RFID sensor using the PIC16f151x by applying SPI. But I cannot write the data into EEPROM of the sensor tag.  Read more

What power regulator should I use – I am making a small device which uses the ATMega328P, an ultrasonicUS-020 sensor and an nRF24L01. If the US-020 is powered from 5V then does the trigger and echo pins of it (5V TTL) affect the 3.3V input pin of ATMega? Should I use a resistor to drop the 5V TTL echo signal of ultrasonic sensor to 3V range for ATMega? Read more

LIS3DH accelerometer sensor doesn’t update – I am working with LIS3DH and have some problems relating to getting data from XYZ axis. In LIS3DH (accelerometer from ST), I enabled FIFO function and operate in stream mode. I use visual C# to display data for testing and debugging. My problem is that the data I read is still one value and does not change even though I move the accelerometer sensor. Read more

Full duplex RS485 over Bluetooth – I have a cable for serial communication which I am trying to get rid of. According to the wiring diagram of the cable it is “RS485: /Rx Tx Rx /Tx Gnd”. Can something like this work?
(Rx /Rx) -> (MAX485) -> (HC05) …… (HC06) -> (MAX485) -> (Rx /Rx)
(Tx /Tx) -> (MAX485) -> (HC05) …… (HC06) -> (MAX485) -> (Tx /Tx)
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PWM LED driver brightness problem – I was designing a circuit using as pilot strobe lights for my UVA/drone. When all the power is on, all the LEDs light up with 100 percent brightness level. After three to four seconds, the pattern from my Nano starts but only with 20 percent brightness. What’s wrong?  Read more

i2C EEPROM maximum addressable memory locations – I am doing a project where I am using a 256 Kbit eeprom (Atmel 24xx256). I need to map the whole memory location to store various parameters in to it. What will be the maximum addressable location that we can use in that EEPROM? Read more

PIC12F629 two ports switching ON – I am trying to toggle two LEDs at GPIO0 and GPIO1 of PIC12F629 with 0.5Sec delay. If I comment out any one LED other one toggles as desired. But when I include both LEDs only one toggles and other one is not toggling (remains ON always ). If I change the order of switching the LEDs, the one which was toggling remains ON and the other one is now toggling.
I have tried both MPASM and HiTech C in MPLAB IDE V8.53. I have replaced the 12F629 with new one also but the problem remains. Read more.

Problem with C code – I am making a Biometric Attendance System and I am having a problem declaring a struct. Read more

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