Microcontroller Top Talks in December 2019 on EDABoard.com

Peer-to-peer, engineer-to-engineer questions and answers from the EDABoard.com engineering community around microcontrollers. Click the “Read more” link and follow the entire conversation and maybe add your two cents by logging in to EDAboard.com.

Car cooling system PSU design-related – I am doing a car cooling system using Peltier (4x) and PIC18F46K22. 2x LM35 are used to sense room temperature and Peltier temperatures. The coding part is almost complete and working fine in Simulation. For Peltiers connected in Parallel, they need a max 15V@15A supply. I need a 12V 3A supply for cooling fans and a 5V 1A supply for MUC+LCD. There is no time to design a DC-DC Converter and a Battery Charger at this time, and hence I am going to use this DC-DC Converter, which gives 24V DC from 24V DC input. Read more

Sensitive metal detector using microcontroller ADC channel –  I need help with sensitive metal detector design. I’m using swg20 x 15 wound on an iron ring with 6-inch diameter. Can this design be used for a sensitive metal detector by using one of the ADC channels of Arduino? Read more

How to write data ds1307 for 8051 – I need your help to understand the datasheet. What is the word address? Is the word address from here 00H to 3FH? Read more

Can I drive a full-bridge with PWM1H1 and PWM1L1 signals? – I need to get 220V AC 5kHz from the Full-Bridge output. Due to low PWM resolution issue in PIC18F, I prefer to use dsPIC33FJ32MC204. My PWM frequency will be 100kHz. I need to get a 50kHz Sine signal from the SPWM. So, can I drive full-bridge (4 N-channel MOSFETs) with PWM1H1 and PWM1L1 signals using 2x IR2112? Read more

Sequence to initialize HD44780 – What are sequence to initialize the HD44780 display device? Details are given on page 42 to initialize in 4-bit mode, but the table seems confusing to me. Read more

How many devices can we have on SPI? – How many slave devices can be connected to the SPI bus? Read more

Simple code buttons to rotary for PIC12F509 – I tried to write my own code for 2 push buttons for a rotary encoder (UP/DOWN Quadrature generator). I have flashed it (of course with changed ports) on PIC16F648, and it works perfectly. It also works perfectly in Proteus simulation with PIC12C509 (C509 was the closest I have to F509). The problem comes when I program it on real PIC12F509 – the chip doing NOTHING, but when I press reset, it resets (i put 2 LEDs on outputs and they flicker on reset). Read more

Possible to ZIP a file using STM32F4 – Has anyone tried to compress a file (.zip format) using STM32F4? Any libraries available for that? I could find libraries for GZIP, but couldn’t find any for ZIP. Read more

Problem with coding 123 – I recently purchased DAC MCP 4725 and just tried connecting it to Arduino so I am giving 0-5 v at A0 pin of Arduino. The problem is MCP4725 is always op 2v only irrespective of voltage at A0 pin. I think its a coding error. Read more

Programming 328P with XPLAINED Mini – Is there a way I can use the programmer on the ATMEGA328P-XMINI to program an external ATMEGA328P on another PCB? Read more