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LED bulb have small circuit inside which makes DC voltage for powering LED. This circuit is power supply for LED which is usually done using one "big" capacitor ~1uF, 275VAC or similar for step down voltage to small DC value.
This is reason why it is not possible to dim LED.
Regards,
Mr.Cube
Dear dany803,
Can You be more specific about your needs?
I really do not understand what you need....
RS485 is physics not protocol. Protocol is something else (You have some protocol which runs on RS485 link...).
Best regards,
Mr.Cube
I working on three phase voltage regulator for mini hydro-energetic plant, I use PIC18F4520 (one for all three phases). I'm sure that this mcu will be enough powerfull for your application.
Always use 20k+ frequency. 10k will produce irritating sound.
Apsolutely agree with BradtheRad
Best...
If you have project where you need to run several tasks parallel then RTOS is good to use.
Every task has it own priority, so RTOS takes care what tasks to run more often. If you have one hardware which more tasks use then you must use some kind of traffic lights (similar to sharing in widows)...
Your programmer can not "see" mcu.
Check connection to mcu.
Check if mcu has power supply.
Check if mcu is OK (try to replace them with new one.
I have similar problem a few times, try to unconnect programmer and connect them again to USB port...
Mr.Cube
Dear kanai42,
To be honest I never use Geiger radiation counter, but this doesn't matter, principal of analog signals is same...
If counter gives you analog signal you can use ADC on mcu to read this signal, and then you usually use linear equation to convert 0-1023 (0-5VDC analog input) to...
You have Rx and Tx pins on mcu.
Just have to connect Tx on mcu1 with Rx on mcu2 and vice versa (Rx on mcu1 with Tx mcu2).
Both mcu uses TTL level for serial port, so no additional hardware is needed.
Protocol is up to your needs and imagination...
Mr.Cube
Male connector is with pins.
Female connectors is with holes.
Pin 1 on male connector corresponding to pin 1 on female connector (they are like in mirror).
See more:
https://en.wikipedia.org/wiki/RS-232 and https://wiki.xtronics.com/index.php/RS232_DB9_pinout
By standard 9 pin connector is...
It is relatively easy.
10bit -> 0000 - 1023
Numers - ASCII
0dec - 30hex (48dec)
1dec - 31hex (49dec)
...
9dec - 39hex (57dec)
This mean that number you get from ADC e.g. 0876, you have to split to numbers 0 - 8 - 7 - 6 and then your ASCII message will be 30h - 38h - 37h - 36h (or in decade...
To wp100 and keith1200rs
Thanks for answer!
OK 25MHz is max quartz, it seems to be fact which I didn't know.
But how PIC works on 40MHz, slower but works:?:
Mr.Cube
PIC18f QUARTZ OSCILLATOR STRANGE BEHAVIOR?!?
Hello friends,
What is typical condensators value for 40MHz quartz?
Step 1: I test first with 24MHz quartz with 13.5pF (two 27pF in serial connection) everything working fine.
Step 2: Then I just change quartz (put 40MHz instead of 24MHz) and PIC...
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