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Your projects / Re: Palmsize quadcopter
« Last post by Leo_ha on December 28, 2016, 07:59:56 AM »
thanks , if you interested ,maybe you can see  www.pcbgogo.com/f ,really recommend.. ;D ;D ;D ;D ;D

I used seeed studio fusion to make a small run 1 months ago and was pleased with the service.
Digital discussion / Selecting Resistors and Caps of Astable 555 Timer
« Last post by NMTrains on December 22, 2016, 22:33:27 PM »
I've used the calculators many times for 555 Astable circuits often with good results.

This morning I ran into a 40Hz problem where all calculators agree on the 3 components, including even a hand calculation and I have to use a capacitor that is way different from what the calculations say.

To get about 42 Hz, I have in the circuit R1 6.8K, R2 22K C 4.7uf

All calculations say this give a frequency of 6Hz

Holding the resistors constant, to get 42 Hz, the calculators say C should be .68 uf.

Almost 1 order of magnitude difference.

What am I not understanding?
General Discussion / 10m IR remote control
« Last post by Scuba2 on December 12, 2016, 01:16:36 AM »
I looked at your IR video , as I have failed to make one.
I have a 38k receiver a mosfet and led to detect an IR presence. I tried 3 remote controls and all work over 10m so I took out the IR led.
I then proceeded to blow it up!
So I tried two of my cheap Chinese led's connected to the diner remote .
They worked perfectly!
Having found a circuit for a remote , it looks like they use very little resistance and high current , but for very short duration.


I will have another go at the weekend but if anyone has any advice it would be great.
General Discussion / Re: Flexible 555 LED Pulsing (Breathing) Circuit
« Last post by kam on November 23, 2016, 09:29:41 AM »
Good Job!
General Discussion / Re: Flexible 555 LED Pulsing (Breathing) Circuit
« Last post by Warren Weiss on November 19, 2016, 09:34:58 AM »
I just replicated the circuit on a breadboard using the substitute parts (PN2222a transistor for T1 and 500K ohm trim pot for R7) and can report that the circuit works as advertised without further modification.  Not sure if I made a mistake on the original circuit or if I used a faulty component.  Just want to let everyone know that a PN2222a will work as a substitute for the BC338.
General Discussion / problem by t1gval in pic assembly
« Last post by mahdifah on November 13, 2016, 09:47:46 AM »
Hello. I want to work with capsense and download project from this site but I have a problem with T1gval . when tmr0 be overflow don't any change on T1gval but when tmr0 be overflow should T1gval set. is here anyone to help me???
General Discussion / Re: PIC Capacitance Sensor with 4 buttons and Multitouch Function
« Last post by mahdifah on November 13, 2016, 09:43:12 AM »
hello every body.
I write this program and my problem is T1gval. when tmr0 be overflow don't any change t1gval but T1gval should be set. do you know why??
Hello. I want to work by capsense in pic but I have a probelm. I use from tmr0 for base time and timer1.
when tmr0 be overflow should become t1gval toggle but I don't have any change on t1gval.
the Important registers are.
is there anyone to help me??

movlw b'11000101'

 movlw b'11000101'         
movwf T1CON   

General Discussion / Re: Flexible 555 LED Pulsing (Breathing) Circuit
« Last post by kam on November 06, 2016, 10:50:15 AM »
You can try a smaller R4 or try bigger R5 to get higher output.
Your projects / Re: RFID based Attendance System
« Last post by abhipoints on November 04, 2016, 13:05:43 PM »
Sorry for the late reply, but i need the source code for this system. Without the source code i would be unable to run this system.
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