I have a problem with Atmega32u4(QFN44 package).
This is my first custom board, I've been using arduinos.
Problem:
VCC -> GND +-430ohm
When connected to 5V heating up(short-cirquit)
There isn't any direct short circuit.
Schematic:
Schematic
Board:
Board
Related
sorry if my query sounds odd. I am trying to determine whether my micro:bit will be affected badly if I did the following:
I have the GND wire of it's battery pack and the GND wire of the 9v battery running through the POWER GND pin of the driver. Currently, the 5V pin of the driver is being used, not the 12V power. I have coded a 2 wheeled( dc gear motor) buggy and want to 'upgrade' it to a 4 wheeled 'monster' buggy.
If I were to use the 12V pin ( and provide the 12V for the power supply, would the GND affect the micro:bit badly at all?
Thanks for your help, I'm new to this and this is my first question too. Any help about electronics is appreciated!
I want to get input from an electret microphone on the raspberry pi 3 in python 3. The electret microphone is max4466 from Adafriut. VCC is plugged into 5.ou, GND is plugged into GND, and OUT is plugged into GPIO 11. I have GPIO 11 set for input, but all I get are 0's. What should I do to get input?
The MAX4466 is an amplifier with analog outputs, not digital ones and zeroes. The GPIO pins are purely digital and can't accept an analog input. In order to digitize the output from a microphone, you need to hook it up to an analog-to-digital converter (ADC). Adafruit sells little ADC boards to help you do this. The ADC digital output would hook up to your GPIO on the Raspberry Pi.
Here's a link to learn about ADCs from Adafruit:
https://learn.adafruit.com/raspberry-pi-analog-to-digital-converters/overview
Is this possible to debug applications on this MCU? Does anyone have experience with this? As datasheet says it is possible to debug in SWD mode but with JLINK /Keil & LPCLINK/LPCEXPRESSO we had no success.
Schematic is a simple breakout board. I soldered SWD pins to MCU's pins. I connected :Pin5:SWCLK/Pin6:SWDIO/Pin3:Reset and GND to LPC812 & JLINK.
Can you show your schematics? SWD should be available.
I have a HC06 bluetooth module and recently I got my Nucleo ST F401RE arduino compatible mbed board. I want to have a communication between Nucleo board and HC06 bluetooth module. Is it possible?
First of all, what Nucleo board you use? F401RE or F411RE
Basically, HC06 is controlled through UART communication.
First step you have to do is connecting UART pins between HC06 and Nucleo.
UART pin connection:
HC06 GND -- Nucleo GND
HC06 TX -- Nucleo RX
HC06 RX -- Nucleo TX
For Necleo side, you can use UART1 freely.
You cannot use UART2(D0, D1) because it is shared with USB serial.
UART1 RX pin: D2
UART1 TX pin: D10
You can create instance of Serial class like following.
Serial uart1(D10 /* TX */, D2 /* RX */);
Beware of voltage difference between HC06 and Nucleo.
The core voltage of Nucleo is 3.3.
My problem is there was a spark when I plug in the voltage source of my 220 V bulb.I have my arduino uno r3,hc-05 Bluetooth Module,Relay Module and 220V bulb.
I cut the wire of my 220V Bulb.
One wire that is near to the bulb was connected to (COM)common connection of our relay.
The other cut was connected to ground.
The Relay Module's VCC was connected to Arduino's 5V.
The Relay's input pin was connected arduino's pin 13 as well as the Normally open(NO) pin of reay.The Relay's ground ws also connected to Arduino's ground.
My Bluetooth module tx was connected to aruino's rx ans Bluetooth module's rx was connected to tx.
I also connected Bluetooth Module,5v to the Arduino's 5v.
and A ground from Bluetooth module to Arduino's Ground.
I made my own version of schematic diagram and this is how it works.It is not that nice but I hoope you will understand.
The small squares serve's as the BreadBoard
https://twitter.com/n_galia/status/419876079403147264/photo/1
Here is a simple relay driver you can use with the Arduino. The component values are not super important, R4 could be larger, R3 can be larger, you can use just about any 5V relay and any NPN transistor. As show it should work with most low/medium sized relay. When active you can check the voltage between Q1's collector and ground. It should be less then a volt. About 4mA is provided by the Ardunio, far below it's output capacity.
PLEASE BE CAREFUL!! you are working with high current and high voltage power. Blowing up an Ardunio is minor compared to the damage you can do to yourself.
The revised schematic might not work either. If your relay is a basic relay a driver will be required. The Ardunio can only sink about 20mA and it's likely your relay will need more to function correctly. The relay coil might look like a short to the Arduino.
If you have a relay with a built in logic level driver or a solid state relay, or even a TRIAC part (not a relay) you might be OK.
In situations like this its advised to use an optical coupler between the Arduino and the relay.
The optical coupler has a transistor that will dive the relay in its output, the transistor is actually a light sensitive transistor (photo-transistor) which is turned on via an LED built into the package. The Arduino would drive this LED (though a limiting resistor) which would activate the transistor to drive the Relay. This way the low voltage electronics are totally protected and isolated from the high voltage stuff.
Ouch!
The Arduino is not compatible of dealing with your 220Vac lines from power and to the light.
Your Arduino may not function correctly anymore.
I have attached a revision to your wiring.