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led blink program

February 18, 2016, 4:18 pm
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I have to make a very simple program for led blinking .
Using buttons 1 and 6 lead me.When the button is pressed for a small time , then Led 1 should
be blinking.
This code is part 2 of the LED blink.
part 1- Lead 5 & 6
part 2- LED 1,2,3 & 4 blinking with batton scan
As long as the button is not pressed until the LED blinks 5-6

But when the button is pressed more then 2 sec & unpressed,led1 blink 12sec . ofter 12 sec part
1 agen run.
But when the button is agen pressed more then 10 sec &...

led blink program
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Code Styling Guide for embedded systems

February 18, 2016, 4:42 pm
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This is not a how to, rather a request. I look at some people code and it looks so organized and nice, where my code works, but is a total disarray. I tend to put most of my code in the main, guess I should use more functions and such. Would someone mind posting an example of how code should be organized and look, and maybe show some things not to do. Some things I wonder, where do you place your functions? In the C++ class I took I was told that functions go after main, but I have seen...

Code Styling Guide for embedded systems
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Separating 315/433Mhz from 60hz

February 18, 2016, 4:57 pm
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I have an AC transformer - 24VAC @ 60hz (fed from 120VAC mains) that feeds a common set of power buss rails in a control assembly.

On this 24VAC buss, we need to inject 315mhz RF from a 2400 baud transmitter (FSK/ASK) and the separate this 315 or 433 Mhz signal back off of the power buss further down the assembly in several locations.

What is the best way to:

1) couple the rf signal and inject it on the 60hz power buss? and
2) what is the best way to pull off just the 315 or 433 mhz...

Separating 315/433Mhz from 60hz
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power supply

February 18, 2016, 5:02 pm
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I have designed a 5V ,350mA fixed power supply with a 12 Vrms step down transformer. the voltage across filtering capicitor should be almost peak value i.e 15V or 16V . but I am getting 12 volts across the capacitor why is it so. the supply is loaded.
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circuit debug

February 18, 2016, 5:04 pm
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what is the event named circuit debuggeing.....?
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Voltage regulator datasheet

February 18, 2016, 6:21 pm
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I bought two of these voltage regulator which are supposed to be 24V-1.5Amps but I can not find the datasheet or pinout. Only on pinout configuration works but the regulator heat sup quite a bit which making me wonder. It also puts our 22.95 volts when the input is 24.22
Anyone familiar with those one?

Thanks
Kal
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Optical analog audio intercom, LED based...

February 18, 2016, 6:33 pm
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What is more convenient for voice band, short range of about 10 metres ? Direct modulation of a LED emitter in AM; or FM with a carrier ? No interference is expected.
Which phototransistor would be convenient for blue light reception ?
'Omnidirectional' (hemispheric) blue LEDs, do they exist ?

I think I saw long ago projects, tutorials and schematics somewhere. Cannot find them now. ¿?
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50 yr Old 3 tube amplifier circuit?

February 18, 2016, 6:38 pm
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Does anyone remember the old 3 tube amplifier circuit that used a 50C5, 35W4 and ???? what was the other tube...........12AT6 or something like that?

Does anyone have this circuit?

I already did a web search there are 100s of old tube circuits but not this one. It was never a great amp but it was a fun project for the beginner.
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Building a control box for Electric beer kettle with temp regulation

February 18, 2016, 7:18 pm
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Hello all,

I am designing a control box for a 15 gallon beer brewing kettle (brew-in-bag method) that will control a 5500 watt 240v heating element. I already am familiar with what the schematic would look like and parts needed to wire up a PID and probe into a thermowell (pt100) that will then use a 40a SSR relay mounted to a heat sink.

My question is this: what can I do to the design if I wish to ALSO control the element with a pot-style knob and bypass the PID entirely, for when I...

Building a control box for Electric beer kettle with temp regulation
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Geek Gardening

February 18, 2016, 8:07 pm
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I like plants and growing things, so this to me is the perfect polly tunnel assistant :D, if I ever get time later in the year :D

https://farmbot.io/
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Audio Controlled LED Chaser using Bandpass Filters and RGB LEDs

February 18, 2016, 9:01 pm
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Well, I have decided to take on a rather ambitious project to start out my 2016, but I am at a loss on where to start. I know what I want the project to do, and have a decent understanding of what needs to be done, but could use a little guidance in what circuit layouts would work best.

I want to make a circuit/combination of circuits that will drive a series of RGB LEDs in sequence, based on the target audio range (treble, mid, bass). I will be using a car stereo pre-amp outputs for my...

Audio Controlled LED Chaser using Bandpass Filters and RGB LEDs
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Looking for Encoder Ideas

February 18, 2016, 9:03 pm
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I finally got a replacement for my Bourns 64-pulse per revolution optical encoder and have been playing with it all day. I can read left and right rotations reasonably well using the following look-up table:
View attachment 95259
The problem is that the zeros mean different things. The first 0 (offset =0) means no change in position. The other 0's are effectively errors, such as skipped reads. The characteristic of which is more than one bit changes in the binary value I am...

Looking for Encoder Ideas
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How does voice recognition kit work with 8051 ?

February 18, 2016, 9:20 pm
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Hello
I just want to turn on/off Dc motor using voice command. I know I need 8051 development board, Dc motor and voice recognition kit http://www.nskelectronics.com/hm2007_speech_recognition_kit.html . I just want to store two words ON and OFF. I don't understand how does voice recognition kit store voice command. Please help me. how to Turn ON/OFF motor using voice command ?

Thank you very much
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Tuning a transciever with a SA

February 18, 2016, 10:08 pm
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I would like to adjust a CB radio and the transmit frequency a little bit using the spectrum analyzer (unless my FC proves to be accurate), what do I need to sample the transmit frequency? I am looking for something to go from the transmitter to a device (the bit I dont know) then out to a dummy load, I believe there is a device with a BNC take off that goes to the SA but I am completely unsure what you use or how you connect it. Sorry if this make no sense! I am wanting to adjust a CB whats...

Tuning a transciever with a SA
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Any Simple Push To On/Off Circuit?

February 18, 2016, 10:14 pm
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Hi, it's been long since i have posted a thread, been kinda busy with life but now back into DIY world and i need help for a flashlight project.

I'm looking for a decent circuit of a push to On/Off circuit. I have designed an awesome flashlight of wood, but I'm having problem with a switch.

I don't like mechanical switches as most of them wear out after a few weeks of use. So any of you experts know any simple reliable circuit, preferably using just transistors or an IC that is commonly...

Any Simple Push To On/Off Circuit?
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How to combine an LDR (Light Sensor Circuit) to an LED Driver using 555 Timer?

February 19, 2016, 8:23 pm
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Can someone help me how do I do a circuit that has a blinking LED operated by 555 timer but only triggers when light is sensed. I know I have to use an LDR but how do I combine this with LED driver if it also uses 555 timer? Please reply as soon as possible. Thank you.
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Im trying to bulid special Midi to Microcontroller device , need own circuit and pro help !

February 19, 2016, 8:35 pm
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We're working on project that controls signals from daw (digital audio workstation - music production software). I 'm seeking for information and help all around .
The circuit needs to handle 64 analog inputs . the point is that i need to have kind of 3 positions for those 64 inputs .
So if the position is 1 then all inputs are assign to first 64 parameters , then if u put the position to B it switches to next 64 parameters and again switching it to position C brings new 64 assign...

Im trying to bulid special Midi to Microcontroller device , need own circuit and pro help !
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Testing MOV's

February 19, 2016, 8:45 pm
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can I test MOV'S with my multi meter? I have a blu ray player power board that had a spike and trying to figure out what is at fault. Suggested by DerStrom8 to test the MOV'S but I tried in diode mode, nothing and resistance got nothing? Here is a pic of the board and I checked all the caps and the diodes too. I see 4 blue MOV'S and have desoldered one end on those. I'm getting back into electronics after a long hiatus so I've been doing a lot of reading and refreshing what little I used to...

Testing MOV's
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Quadrature Demodulation at 90 KHz

February 19, 2016, 8:48 pm
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Hello all

I have a linear frequency modulated (LFM) signal having 90 KHz center frequency and 20 KHz bandwidth around it. My problem is to demodulate it at base band to get I and Q both (phase information required). I have searched a lot at internet but mostly found quadrature demodulator ICs have starting input frequency range in MHz. AD8333 was what i found having lowest input frequency but even it does not work for 90 KHz (as i discussed with analog devices technical staff).

Can any one...

Quadrature Demodulation at 90 KHz
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How do I use voltage regulators

February 19, 2016, 9:08 pm
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Hi iGuys,

I wired two different circuits both with voltage regulators and not getting the results I was hoping for and looking for insight on what I'm doing wrong.

First circuit is a 24VAC rectified to 24DC. The rectifier I'm using is GBU605 and the voltage regulator is a 78248T. I couldn't find either in LTSpice so I used whatever I could find to for illustration purposes.
I get 35.4VDC at the input of the voltage regulator and the output...

How do I use voltage regulators
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