(editor’s note: Intrigued by the problem? Have a question or optional solution? Then click the “Read more” link and follow the conversation on EDAboard.com or log in to EDAboard and participate in the microcontroller forum thread.)
Sine wave inverter design help – I am designing a sine wave inverter using a PIC16F1936. I have generated two signals which are complementary and I am getting a sine wave from the two signals after the RC filter in Proteus. Now I want to design the power stage. Can I design a power stage without output transformer that is using just MOSFETs? If yes, should I use an H-bridge topology? If not, then for a 5 or 5.25kW inverter, what should be the transformer rating for the primary and secondary side V and I ratings? Read more
3-phase induction motor driver and power-stage design help – I am designing a 3-phase induction motor V/F control. I am planning on using a dsPIC33FJ32MC202. There will be six SPWM signals. Will there also be three complementary sine wave PWMs? If yes, which signals are complementary? The signals are
I am planning to use IRF540 for the driver stage. Read more
Software serial RS232 interface for 16F877a – I’m trying to create a software UART for my 16f877a controller for interfacing a serial Bluetooth and GSM modem for home automation purposes. But I got stuck in the first step itself. FI tried FORCE_SW function on the CCS C compiler but it is not working properly. The data displayed on the terminal is full of junk. Read more
89s52 consumes more current in power-down mode – I am trying to work on power-down mode using an 89S52. My problem is that it consumes about 0.500μA of current but the data sheet says current consumption in power-down mode is 50μA. I have not connected any components to my circuit and it contains only 89S52, 11.05962 crystal, 33pf capacitors for crystals, and an Li-ion battery. Read more
Relationship between Vref and LSB error of ADC – Can someone explain to me the relationship between Vref vs LSB error? I’m a bit confused with datasheet of ADC. I’m using an LM35 sensor for temperature measurements and an ADC MCP 3004 for analog-digital conversion. This AD5142 IC has me stumped. I have tried every combination I can come up with and there is nothing I can do to make it work.
Here’s the schematic:
Here’s the actual layout with the programming probe pads with the corresponding microcontroller controller terminals:
Here are the signals being sent for writting a 1 to pot 0:
PIC16F676 analog AC inputs detecting problem – I am having a problem with a PIC16f676 controller for detecting an analog input to RA0, RA1, and RA2. It’s working well only in RA0 and RA1. I think its comparator output pin is not detecting input AC voltage. Read more
How to build a board for any microcontroller – I want to learn how can I build a microcontroller based board. I have a project where I want to read some sensor values, drive some motors, and transfer my data through Wi-Fi, Ethernet, etc. I am looking for a fundamental way to learn circuit design and the building of any boards I like with any microcontroller I choose. Read more
CCS PIC with SPI communication – I’m trying to write some values in the 25AA160 EEPROM but without success. Below is the debug window. Read more
Blue HD44780 16×2 LCD with 3.3V? – Can I use a blue HD44780 16×2 LCD with a 3.3V power supply? Can I hack the 5V LCD to 3.3V? Read more
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