Tagged Questions

3
votes
3answers
84 views

Energy efficient one button on/off with extra function

(Old) cellphones have a button to turn it on (when off), end a call (when on, short press) or turn it off (when on, long press). I need something similar for a microcontroller. The device is ...
3
votes
2answers
227 views

BJTs versus (MOS)FET to switch a load from a microcontroller

I would like to know what are the reasons for choosing bipolar junction transistor (BJT) versus a field-effect transistor (FET) (MOSFET or a JFET) to switch a load from a microcontroller. In our ...
6
votes
4answers
224 views

Protecting Microcontroller Input Pins from Soft Power Switch

I'm working on a soft power switch for a microcontroller where a momentary switch can turn the circuit on (including microcontroller), and then when the switch is pushed a second time, the ...
0
votes
2answers
70 views

iCMOS analog switches and multiplexers

Does anyone have any experience with Analog Devices iCMOS high voltage analog switches or multiplexers like the ADG1434 or ADG1411? The specs for iCMOS sound very impressive. But they've been ...
4
votes
1answer
169 views

Wiring an illuminated toggle switch

I'm trying to build a model rocket launcher circuit. So far I have this The igniter requires 12V and 3A, BAT1 is 12.6V 9800mAh. The arduino input pin should read HIGH when the igniter is connected ...
4
votes
3answers
795 views

Using MOSFET as switch to swtich device

Will my circuit work for the following goal?: When INPUT_N is HIGH (i.e. micro is not driving it and it is pulled up to 3.3V), VCC pin on device will have 24V. When Microcontroller drives INPUT_N to ...
1
vote
2answers
200 views

Switch on a LED: why doesn't this code work?

I am using DEMO9S08AW60E and using Codewarrior(Version: 5.9) with Processor Expert. ...
1
vote
1answer
209 views

P-chan MOSFET as power switch

I want to create a power switch (on/off) for a hot-swap plug-in module that connects to my (future) PCB. Got a MCU on board and a single 3.3V supply, fed from AA batteries with through a DC/DC, this ...
1
vote
1answer
225 views

Alternative to optocoupler? Other switching devices?

I have a part that classifies what kind of power I get on ethernet by presenting different loads. For example, the part needs to have a 100 Ohm resistor across two of its pins, and the part will ...
0
votes
0answers
20 views

switching 230v ac using micro controller [duplicate]

Possible Duplicate: Control 220V AC line using MCU I was doing a project on house wiring so please help me to implement a micro controller like x10,8051 or any other devices for switching ...
2
votes
2answers
1k views

Driving a large 7 segment display using a micro-controller

I need to drive a large seven segment display (segment length is a about 2 inches) using a micro-controller (PIC 16F877). I've driven normal seven segments directly from PICs without issues, but I ...
12
votes
4answers
1k views

How to switch power of microcontroller by button?

I have a microcontroller device with battery power. Currently I toggle power by simple on/off switch. I want to toggle power by one pushbutton with minimal modification of the schematic (and ...
2
votes
3answers
708 views

Implement MicroController Power Switch and re-use the button for other features

This is similar to other questions, but I feel it is different because of the reuse of the "power" button. I want a "latching" Momentary Power button. Behavior: User Pushes momentary button, ...
0
votes
1answer
436 views

Arduino to act as a switch for a remote

I have a wireless remote control for a light. It runs with a 12V battery. It has two mini Omron type B3F momentary ON switches (mini push-button switches). One button is for Light ON, the other for ...
0
votes
1answer
264 views

how to design switching regulator in battery operated device?

My device consists of ATMega, GPRS modem and sensors. Modem occasionally hangs and I need to reset it from mcu. The whole system is powered from li-ion battery. I can't find any switching DC-DC ...
2
votes
1answer
140 views

Looking for device that help me split a n bit input bus, or n analog lines into two or more bus at output

I looking for device that help me split a n bit input bus, or n analog lines into two or more bus at output Please consideration concept diagram below. At input there is n bit input bus, or n ...
1
vote
2answers
803 views

Need advice on microcontroler to switch relay on/off

I am trying to connect a relay (OMRON G2RL-2A DPST 12VDC) to my PICAXE 20x2 microcontroler. I also have an UNL2803A relay driver. I managed to get microcontroler to work quite nice, so I don't have ...
6
votes
3answers
2k views

Control 220V AC line using MCU

I want to switch ON and OFF an incandescent bulb using MCU. Please suggest an electric switch (like relay or something) for 220V 50Hz AC line which can be used here. I would prefer something very ...
0
votes
5answers
574 views

How to switch many (15) low power (40W) lightbulbs from a microcontroller?

The power rating on the bulb is the amount of power the PSU has to deliver in order for the bulb to light up the brightest right? Hence if it's a 40w bulb I need 40watts of power for it to light up ...
7
votes
4answers
818 views

Latching switch ideas

I'm trying to build a latching switch connected to a door and would appreciate ideas. The switch is connected to a microcontroller input pin, and I'd like it to operate as follows: When a person ...