Electronic – arduino – Problem shrinking Arduino project to ATtiny 85 20MHz

arduinoattiny

This is a similar problem as this one: Programming an ATtiny 85 with Arduino

However the latter question refers to older software/arduino and did not reach a resolution.

I'm using Arduino 1.0.1 (also tried this with 1.0.2) on Mac OS X ML. I've successfully ran the following program on the arduino:

int LED_Pin = 3;
int howBright;
void setup() {
  pinMode(LED_Pin, OUTPUT);
}
void loop() {
  howBright = random(128,255);
  analogWrite(LED_Pin, howBright);
  delay(random(50,150)); 
}

Now I have an ATtiny 85 20MHz wired up as instructed here: http://hlt.media.mit.edu/?p=1695

I'm using the hardware for the ATtiny85 here: http://code.google.com/p/arduino-tiny/downloads/detail?name=arduino-tiny-0100-0015.zip&can=2&q=

I am "uploading with programmer" with "Arduino as ISP" to the ATtiny85 and get this error:

avrdude: stk500_recv(): programmer is not responding

Best Answer

I suggest you to confirm your steps with http://arduino.cc/en/Tutorial/ArduinoISP and https://www.sparkfun.com/tutorials/200 to be sure. It seems you didn't upload Arduino ISP code to your Arduino first. Plug your Arduino to your computer and upload ArduinoISP from Examples menu. Then you may retry to program your Attiny by selecting "Arduino as ISP" from Tools | Programmer menu.

Related Solutions

Electronic – arduino – Programming an ATtiny 85 with Arduino

UPDATE 2

If the tiny is running a sketch then it must already have a bootloader.

I think there are a lot of factors to be wrong here because the tutorial was written pre arduino 1.0. I think the 1mhz one is a problem and best avoided for now. The tin85 w/ Arduino ISP sounds to be pre-arduino 1.0 and needs to compile correctly.

In a few days I will have some time so if you haven't fixed it by then I hope to give you some info.

First I will take 2 arduinos, one as ISP and one as normal arduino. We need to prove the ISP sketch is working correctly when uploading blink to a 2nd arduino.

Once the ISP is proven with arduino 1.0 we need to see why normal compile of the tiny85 fails. It might be there is an updated tiny85 hardware folder for arduino 1.0 on the web but if not then we can change the tiny85 hardware folder sources to use 1.0 instead (hopefully).

FYI: You mention the arduino.h, in versions earlier than arduino 1.0 the file was called wprogram.h, arduino 1.0 also expects a few other differences. If the tiny85 is including wprogram.h I think it will be a problem to also include arduino.h

IDEA

If you have some time spare why not go onto the arduino.cc and down load version 0023 of the arduino IDE. (All of the older version of arduino are available). Upload the Arduino ISP example to the UNO using 0023 then try the upload to the tiny85 (w/ arduino ISP) for the blink sketch. I would expect 0023 to work exactly like the video, so if it fails you can look to the wiring of the tiny85 for the problem. It it works we will know we need to update the tiny85 hardware folder to arduino 1.0 format

If it works in 0023 then you should follow Deans instructions above for Arduino 1.0.1.

UPDATE

The only way I can find to reproduce the error you see is if I attempt to "Upload using programmer" when the programmer is set to "AVRISP". If I upload the ISP sketch to an arduino and attempt to program an unconnected tinyxx I get different errors.

So sorry if these are time wasting questions but.. are you clicking "Upload" in the arduino ide or "Upload using programmer"? You should be clicking "Upload" after selecting the ATTiny (w/ Arduino ISP) as the board.

Info..

It is a bit confusing but the board definition for ATTiny xx (w/ Arduino ISP) forces the correct programmer settings for the normal arduino "Upload". In the arduino ide, the menu item "Upload using programmer" uses whichever programmer is selected on the "Tools>Programmer" menu, in this case probably AVRISP mkII which, if unconnected, will produce the error you have reported.

Electronic – arduino – ATTiny Default AREF

Perhaps you are changing the A/D reference mode somewhere else in your code? You can double check this by adding a call to analogReference(DEFAULT) just before your call to analogRead(). This should select Vcc as the input to the A/D Mux on the ATTINY85 just as you expected.

Here is the ADMUX register from the ATTINY85 datasheet... ATTINY85 ADMUX Register

Here is the relevant code excerpted from the Arduino library....

#if defined(__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__) || defined(__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
65  #define DEFAULT 0
66  #define EXTERNAL 1
67  #define INTERNAL 2

uint8_t analog_reference = DEFAULT;

void analogReference(uint8_t mode)
{
        // can't actually set the register here because the default setting
        // will connect AVCC and the AREF pin, which would cause a short if
        // there's something connected to AREF.
        analog_reference = mode;
}

int analogRead(uint8_t pin)
{
        uint8_t low, high;

        if (pin >= 14) pin -= 14; // allow for channel or pin numbers

        // set the analog reference (high two bits of ADMUX) and select the
        // channel (low 4 bits).  this also sets ADLAR (left-adjust result)
        // to 0 (the default).
        ADMUX = (analog_reference << 6) | (pin & 0x07); 
...

Best Answer

Related Solutions

Electronic – arduino – Programming an ATtiny 85 with Arduino

Electronic – arduino – ATTiny Default AREF

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