All Questions
Tagged with optoelectronics microcontroller
16 questions
2
votes
1
answer
261
views
SWD Connection to MCU and Appropriate Configuration for Reset Pin
I aim to establish a connection between SWD header and an STM32 MCU on PCB, having identified the relevant pins on MCU (SWO, SWCLK, and SWDIO). I have two inquiries:
Is it appropriate to connect ...
- 195
0
votes
1
answer
545
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Connecting 6 push buttons with ESP32 with 1 common pin
Hey all I have 6 buttons that have the following voltage:
I want to hook up a 4N25 to each one of these so I can use the ESP32 as a "virtual push" to each of these buttons. When the button ...
- 805
0
votes
2
answers
343
views
Help using an FOD3182 OptoCoupler
So this is the Optocoupler I will be using:
https://html.alldatasheet.com/html-pdf/505064/FAIRCHILD/FOD3182/978/2/FOD3182.html
My question is with the schematic of the data-sheet. Using Ni-multisim I ...
- 1
1
vote
1
answer
538
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DC Solid State Relay Common Ground
I have an application which would involve having data lines connected to a microcontroller which would signal at lvttl (3.3v) levels and also take in 24v for a resistive load (~600mA). I have ...
- 21
0
votes
1
answer
395
views
Can I drive an optocoupler input with just 0.5mA (500 microA)?
Im trying to interface a keypad button in a device with a MCU, and they need to be in different circuits, with no shared GND.
This keypad button has 5V DC when not pressed, and 0V when pressed. I ...
- 587
0
votes
1
answer
2k
views
Is this optocoupler driving relay circuit reliable and works great?
This is the circuit that I have, the optocoupler is an EL817 and the transistor is a BC817, the 24V relay is an Omron g2r_1_e, a 24V coil relay.
But when the optocoupler input is floating (not ...
- 31
0
votes
1
answer
241
views
Interfacing a microcontroller digital IO
I'm working with some microcontrollers, and I'm quite confused about how to interface the digital I/O. I've already see some projects with opto-couplers on outputs, other ones with buffers, so I'm ...
0
votes
1
answer
201
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Increase LED Brightness
The schematic shows one row of my 16(row)x32(Col) LED matrix. Each row has 32 LEDs.
I'm Scanning rows @ 1/16th rate.I'm using a PIC micro controller. I use 3V LEDs. The problem is LEDs are dim.
How to ...
- 93
2
votes
1
answer
626
views
Driving IRF9530 MOSFET with 5V
I want to drive the IRF9530 P-Channel FET with 5V PIC microcontroller. My load is 3.2A. schemtic shows one row in my LED matrix. Scanning @ 1/16th rate, so peak current per LED will be 64mA and the ...
- 93
1
vote
2
answers
417
views
Improve Brightness in LED Multiplex
I’m doing a 16 rows & 48 column LED matrix design. The attachment shows only one row & some columns.
I’m scanning rows @ 1/16th rate. Designed for 4mA average current to the LEDs. I’m doing a ...
- 93
1
vote
3
answers
630
views
LED Matrix Leakage LEDs
I'm doing a LED matrix design and it's a cathode row design. Attached is a picture of my matrix design.
The design works ok and I can show any pattern in the matrix.
The problem is when a leak LED ...
- 93
0
votes
1
answer
456
views
MID400 used in "Unsaturated" Mode
I've been spec'd a MID400 in a high voltage A/C power monitor circuit. After receiving the prototype (board is done), I've determined this device is for power on/off application. Problem is I need to ...
- 251
0
votes
0
answers
264
views
Low cost low speed fiber optic connection for embedded applications
I would like to use a fiber connection to send data between two nodes. The nodes would typically have a 8 or 32 bit micro controller. I need data rate of 2 Mbps or higher and distance is about 100 ...
- 969
5
votes
1
answer
684
views
Q: Check if an LED in my circuit is still "good"
I have an electrical circuit which uses an LED, connected to a µC, to show the status of an x-ray source in another room. Obviously this LED is important to have in a working condition.
Now, LEDs can ...
- 621
2
votes
2
answers
499
views
Audio optical cable electronic switch
Right now I'm using this to switch between three devices for my home stereo and I want to replace this with an electronic method (no moving parts) with a remote I made. I already have an rf module ...
- 129
3
votes
3
answers
636
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Microcontroller or arduino alternative for small cell-phone sized device?
I am doing a project in which I need to read RGB values from a color sensor TCS230 and send it to a microcontroller and use an linear equation to get glucose value from it and display it on an LCD.As ...
- 119