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1  Using Arduino / Project Guidance / Re: Turn on Arduino at intervals on: March 23, 2014, 04:38:39 pm
"The low power consumption options using any of the official Arduinos all involve powering the whole unit off and using an external timer circuit to power it back on as required. That seems like a more expensive, more complicated and more difficult solution but it's technically feasible if you are committed to using an official Arduino."
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That's what I had in mind, I use a Freetronics Eleven board and don't want to go to the trouble of stripping it down.
2  Using Arduino / Project Guidance / Re: Turn on Arduino at intervals on: March 23, 2014, 01:43:43 am
A Christmas tree light timer sounds fine as long as its battery powered as I don't have mains at the Arduino.
3  Using Arduino / Project Guidance / Turn on Arduino at intervals on: March 23, 2014, 01:16:22 am
I have an Arduino used as a data logger that radios data at hourly intervals.

The trouble is the power draw between samples. What I need is a low power consumption timer circuit that can wake the Arduino up every x minutes (programmable) and then switch it off after it transmits a reading.

I'm sure it could be done with a 555 timer or similar, but I'm not a electronics person so would appreciate some help.

thanks in advance

steveh
 
4  Using Arduino / General Electronics / Re: Fast circuit breakers on: January 07, 2014, 08:32:06 pm
I'll have a look for an em fuse.

 So how about surge protectors on power points, they must do a similar job, protecting against lightning strikes etc ?
5  Using Arduino / General Electronics / Re: Fast circuit breakers on: January 07, 2014, 08:13:07 pm
No, it's a 9V LIPO from an R/C car, and thanks for the info.
6  Using Arduino / General Electronics / Re: Fast circuit breakers on: January 07, 2014, 07:18:01 pm
Any over current demands produced by motors, servos, or faulty connections (my incompetence basically). I'm building a r/c aircraft using xBees, motors and servos to move the controls and I don't want to overload the Arduino. I'm using a 9V battery and a Ardumoto motor driver, but Ill be adding things down the line, leds, camera module etc and I want to protect all this if I add too much stuff.
7  Using Arduino / General Electronics / Fast circuit breakers on: January 07, 2014, 06:47:57 pm
Are there any available, fairly cheap circuit breakers that would protect and arduino project from unexpected current surge ?
8  Using Arduino / General Electronics / Re: Beginner's question. on: January 06, 2014, 01:42:18 am
I'm not an engineer either and I don't have time to do a course in electronics (I tried it once), so I've got the idea that there is a lot of info on the web for the sort of things I want to do, and someone would have already designed a circuit for the job I'm doing. Take a look at the top of this page, a guy has designed heaps of circuits for different things which are worth looking at. It's a choice between spending time understanding how to do things yourself, or pinching someone elses ideas. I've decided I'll go the second route, it will save a lot of time.

Good luck with whatever you decide.
9  Using Arduino / General Electronics / Re: Can arduino be used commercially or just for hobbyist ? on: January 05, 2014, 04:54:26 pm
So if you buy an Arduino board and effectively re-sell it in a commercial product, do you have to pay any royalties or license fees to anyone ?
10  Using Arduino / Programming Questions / Re: what does this error mean (avrdude: stk500_getsync(): not in sync: resp=0x00) on: January 04, 2014, 05:17:46 pm
I just got the same error. Are you using a shield with a DLINE/UART switch ? If so make sure it is set to DLINE when uploading the sketch, then set to UART before running the sketch.
11  Using Arduino / Motors, Mechanics, and Power / Re: Ardumoto not working on: January 01, 2014, 04:08:07 pm
Quote
Does the 9v power supply have sufficient current capability to power a motor?

Both the power supply and the motor came from an RC car, so they were designed to work together
12  Using Arduino / General Electronics / Re: Rabbit killer on: January 01, 2014, 04:05:35 pm
I accept those those limitations, but rabbits don't usually "jump" high in the air, they hop along, and being a much smaller animal than a cow would receive more of a jolt than larger animal.
13  Using Arduino / Motors, Mechanics, and Power / Re: Ardumoto not working on: January 01, 2014, 04:06:30 am
There appeared to be a short across the power output terminals. Once I removed them the thing worked.

Thanks
14  Using Arduino / Motors, Mechanics, and Power / Re: Ardumoto not working on: December 31, 2013, 09:11:14 pm
Voltage at output point ? SFA would be about it. 16 V at Vin on the Ardumoto
15  Using Arduino / Motors, Mechanics, and Power / Ardumoto not working on: December 31, 2013, 05:40:48 pm
Hello,

I have an Ardumoto motor driver shield plugged into a Freetronics Eleven Uno compatible.

I've hooked it all up, downloaded a sample sketch (modified because I only have one motor), applied 9V to Vin, and the yellow and blue leds on the Ardumoto light up which seems to indicate the sketch is running, but the motor does not run. Power direct to the motor runs ok. The single motor is attached to the "A" connector.

Any idea what the problem could be ?

Sketch is below

Quote
//=========================================
// Motor Control using Ardumoto Shield
//=========================================

int pwm_a = 3;  //PWM control for motor outputs 1 and 2 is on digital pin 3
int pwm_b = 11;  //PWM control for motor outputs 3 and 4 is on digital pin 11 - Second motor if attached
int dir_a = 12;  //dir control for motor outputs 1 and 2 is on digital pin 12
int dir_b = 13;  //dir control for motor outputs 3 and 4 is on digital pin 13 - second motor if attached


void setup()
{
  pinMode(pwm_a, OUTPUT);  //Set control pins to be outputs
  // pinMode(pwm_b, OUTPUT);
  pinMode(dir_a, OUTPUT);
  // pinMode(dir_b, OUTPUT);
  
  analogWrite(pwm_a, 100);       
  // set both motors to run at (100/255 = 39)% duty cycle (slow) 
  // analogWrite(pwm_b, 100);
  
}

void loop()
{
  digitalWrite(dir_a, LOW);  //Set motor direction, 1 low, 2 high
 // digitalWrite(dir_b, LOW);  //Set motor direction, 3 high, 4 low
  
  delay(1000);
  
  analogWrite(pwm_a, 255);     
  //set both motors to run at 100% duty cycle (fast)
  // analogWrite(pwm_b, 255);
  
  delay(1000);
  
  digitalWrite(dir_a, HIGH);  //Reverse motor direction, 1 high, 2 low
 // digitalWrite(dir_b, HIGH);  //Reverse motor direction, 3 low, 4 high
  
  delay(1000);
  
  analogWrite(pwm_a, 100);
  // set both motors to run at (100/255 = 39)% duty cycle   
  // analogWrite(pwm_b, 100);
  
  delay(1000);
}

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