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271  Using Arduino / General Electronics / Re: DC DC step down converter for smart battery charger on: April 17, 2013, 08:18:28 am
Seems like I've found a schematic of the CV/CC version?

Attached is a conceptual (untested) schematic
272  Using Arduino / Project Guidance / Re: Wifi shield as server without router, webserver, internet? on: April 16, 2013, 10:59:36 am
Yes, you can, use static IP on both wifi shield and your ipad.
273  Using Arduino / Project Guidance / Re: 18v15 Pololu Motor Controller - Need Help With Coding PWM on: April 16, 2013, 09:55:20 am
connecting Pin 11 on Arduino with PWM pin on Pololu. I have connected 'DIR' pin to pin 3 on Arduino.
That is correct connection

On the other end of the Motor controller,I have connected a 9V battery into the inputs of the Pololu and a VEX motor into the Pololu 'OutA' and 'OutB'
Are you said those 9V transistor square battery? it may not have current for your motor.

VEX motor? two wire or three wire?
274  Using Arduino / Project Guidance / Re: 3 light resisors to max on: April 15, 2013, 06:55:26 am
Read this
275  Using Arduino / Project Guidance / Re: 18v15 Pololu Motor Controller - Need Help With Coding PWM on: April 15, 2013, 06:39:37 am
Try this code (not tested)
 * Pololu High-Power Motor Driver 18v15 test program
 Note: The pot is not directly controlling the motor,
 but the Arduino is getting the value of the pot and
 using PWM to control the motor speed based off of that value.

int pot = 0; // analog A0
int Dir = 3; // Direction input
int motorPin = 11;  // Pulse width modulation input           

void setup()                    // run once, when the sketch starts
  Serial.begin(9600);           // set up Serial library at 9600 bps
  pinMode(pot, INPUT);
  pinMode(Dir, OUTPUT);
  pinMode(motorPin, OUTPUT);

int getPot() {
  int v;
  v = analogRead(pot);
  v = map(v, 0, 1023, 0, 255);
  return v;

int motorFoward() {
  analogWrite(motorPin, getPot());
  digitalWrite(motorPin, LOW);
  digitalWrite(Dir, HIGH);

int motorBackward() {
  analogWrite(motorPin, getPot());
  digitalWrite(motorPin, LOW);
  digitalWrite(Dir, LOW);

void loop()                     // run over and over again
276  Using Arduino / Project Guidance / Re: How to Shrink My Project on: April 12, 2013, 06:47:25 pm
Make a stripboard Arduino clone, AKA the veroduino
277  Using Arduino / Project Guidance / Re: Connecting batteries for longer work time ? on: April 07, 2013, 04:57:18 am
Most of 9V Battery have Capacity about 400 to 550 mAh, if you can last for 4 day, that about 100mAh pre day.
So for a month you will need 3100 mAh battery or 3.1Ah battery. If weight is not your consideration, you can use SLA battery,
but if you need to have light weight then select LiPoly battery.
but for 3.1Ah of LiPoly battery still about 0.5 Kg of weight.
278  Using Arduino / Project Guidance / Re: Help please with Tone4 tutorial on: April 06, 2013, 11:17:14 pm
Look at this post, using mosfet,157647.msg1181162.html#msg1181162;topic=157647.0;attach=39938
279  Using Arduino / Project Guidance / Re: Analog Refence on: April 06, 2013, 11:03:17 pm
Question is: If i do set AREF to 2.56V, can I do like this without damage the arduino?
No you can't, there will damage the arduino cause the input can not more then -0.5V

The circuit shown had shift the mid point of the AC voltage above ground level.
280  Using Arduino / General Electronics / Re: Getting 5V D/C from single live wire A/C light switch on: April 06, 2013, 03:08:23 pm
For a future project I've been considering using the below USB wall chargers (5v, 1A). Not sure about the size of the components inside the enclosure.

Stay away from super-cheap AC adapters built by mystery manufacturers. Spend the extra few dollars to get a brand-name AC adapter. It will be safer, produce less interference.
281  Topics / Home Automation and Networked Objects / Re: Cheap bluetooth remote controllers on: April 06, 2013, 01:00:03 am
The USB/Bluetooth dongle need driver from the PC to work, so it can't connect to relay directly.
You can use this JY-MCU HC-06 Bluetooth Wireless Serial Port Module with Attiny MCU to control a relay for less then $20
282  Topics / Education and Teaching / Re: Android Bluetooth to Arduino on: April 06, 2013, 12:41:49 am
Will try out. Thanks.
283  Community / Bar Sport / Re: Good, Cheap Camera for Close Ups? Macro? on: April 05, 2013, 11:59:00 pm
Or you can get one of this 60X Zoom LED Micro Lens Microscope w/ Protective Case for iPhone
284  Community / Bar Sport / Re: Is there a forum area for power sources? on: April 05, 2013, 11:45:06 pm
I had one of those, had tested about 7700 to 8000 mAh@5V. The 12000mAh was the battery capacities at 3.7V
285  Community / Local Groups / Re: Any fans in Singapore? on: April 05, 2013, 11:06:11 pm
Hi mharkus,
What is your progress on the android dev? I'm dev android too.
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