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1  Using Arduino / Microcontrollers / Re: Rfid based student attendence System on: April 08, 2014, 12:26:50 pm
you connect a switch, then you write the code - simples
2  Using Arduino / Microcontrollers / Re: Can anyone recommend a ADC? on: April 08, 2014, 09:47:07 am
Hi - the drift you are looking at is normal on arduino due to the non isolated ground for the analog ports, you can get DIP packages or solutions like http://proto-pic.co.uk/ads1015-12-bit-adc-4-channel-with-programmable-gain-amplifier/ - What sort of resolution are you looking for? is 10 bit enough or 12 bit? do you need to go as high as 16 bit resolution. Adding bypass capacitors to your circuit may help as these help the voltages to remain relatively stable. Also look at the datasheet for your source/sensor as it may offer more advice on circuit layout to reduce 'noise'.
3  Using Arduino / Project Guidance / Re: rtc module on: April 08, 2014, 07:01:01 am
read the time, store the Hours,  read it again, if the hours is different do stuff..
4  Using Arduino / Programming Questions / Re: Programme hyt221 on: April 08, 2014, 03:42:47 am
Can you post your code so far, a link to the hyt221 (including data sheet) and move your question to collaborations as you are unlikely to find someone to do your work for free.
5  Using Arduino / Installation & Troubleshooting / Re: blink example isn't working on: April 07, 2014, 04:45:20 pm
The Rx/Tx leds don't blink with this example, it is the led on the board that blinks.
6  Using Arduino / Microcontrollers / Re: AnalogRead - readings are erratic on: April 07, 2014, 02:06:28 pm
take 12 readings, disregard the largest and smallest, then take the mean of the other 10.
7  Using Arduino / Project Guidance / Re: How do you wire 5 pin rotari encoder All pins in one side GND, +, SW, DT, CLK ? on: April 06, 2014, 07:24:58 am
Not speaking english does not mean you are not from the US - #Telling us where you are may help
8  Using Arduino / Project Guidance / Re: How do you wire 5 pin rotari encoder All pins in one side GND, +, SW, DT, CLK ? on: April 05, 2014, 01:28:01 pm
If you use your meter to check continuity -
3 pins on encoder, middle to gnd, and find out where the other 2 pins go, the 2 pins on the other side are the switch.
9  Using Arduino / Project Guidance / Re: How do you wire 5 pin rotari encoder All pins in one side GND, +, SW, DT, CLK ? on: April 05, 2014, 01:15:57 pm
Can you supply the make/model of the encoder?
10  Using Arduino / Programming Questions / Re: LED Light Sensor on: April 04, 2014, 05:35:10 am
LEDs are LIGHT EMITTING DIODES, they have very limited reaction to light detection.
11  Using Arduino / Programming Questions / Re: change adresse i2c hyt 221 on: April 03, 2014, 11:40:19 am
Thanks for letting us know.
12  Using Arduino / Microcontrollers / Re: Arduino Due and Serial Connections on: April 03, 2014, 08:31:36 am
Please read the sticky at the top of the forum and re post the requested information.
13  Using Arduino / Microcontrollers / Re: Bootloader with um232r to atmega168 on: March 31, 2014, 10:30:50 am
Ebay is cheapest if not fast - plenty of retailers, but I can't recommend any as I do not know where you are from.
14  Using Arduino / Microcontrollers / Re: ATMEGA168PA with Arduino as ISP. on: March 31, 2014, 10:29:30 am
"avrdude -p atmega168p -c avrisp -P COM3 -U lfuse:w:0x62:m -U
hfuse:w:0xdf:m -U efuse:w:0xf9:m -b 19200 -U flash:w:blink.hex"


Try


"avrdude -p atmega168p -c avrisp -P COM3 -B 1 -U lfuse:w:0x62:m -U
hfuse:w:0xdf:m -U efuse:w:0xf9:m -b 19200 -U flash:w:blink.hex"
15  Using Arduino / Microcontrollers / Re: Bootloader with um232r to atmega168 on: March 31, 2014, 06:17:17 am
search for FTDI bitbang arduino bootloader on google
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