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    Donovan Buck
    @dtex
    It’s a cool device. I’ve got three and expect to be doing lots of IoT stuff with them. I’m anxious to see how the Spark Photon stacks up but the Imp guys have set the bar pretty high.
    Derek Wheelden
    @frxnz
    I really like the form factor of the imp, and the setup seems reasonable simple
    dtex @dtex needs a second set of eyes
    Rick Waldron
    @rwaldron
    I can look tomorrow :)
    Donovan Buck
    @dtex
    I'm stuck on something that really shouldn't be that hard. My I2C reads are not getting the data I expect. It seems like I'm reading from the wrong register or parsing the response incorrectly. I need to clean up some indentation/white space stuff that's polluting the diff real quick first.
    Donovan Buck
    @dtex
    Okay, I’ve done that. dtex/tyrion and dtex/imp-io have the latest. I’m using @briangenisio ’s MPU6050 to test with. It works great on an Arduino and the I2C reads will return values like [2, 228, 251, 40, 62, 72, 242, 16, 253, 0, 1, 70, 255, 59] when the device is at rest and room temperature. With reads from the Imp under the same conditions I’m seeing values like [0, 0, 0, 0, 1, 65, 232, 1, 0, 243, 92, 245, 128, 255] and they bounce around a lot (like I’m not reading the same registers each time). I even hard coded the read command and listened to the response in Squirrel to take out any confusion along the way but I got the same incorrect results.
    Rick Waldron
    @rwaldron
    I just pinged Matt on Twitter to come see us in here. I'm about to get in the car to drive to New York, but I can dive in with you later this afternoon
    Donovan Buck
    @dtex
    Groovy. Safe trip.
    Rick Waldron
    @rwaldron
    Thanks, I'll check in later :)
    Donovan Buck
    @dtex
    @beardedinventor I’ll build a super simple device.nut (no J5/Imp-io/Tyrion) to replicate the issue and share that. If it doesn’t replicate, that’ll help me too.
    Matt Haines
    @beardedinventor
    @dtex - cool, I have a couple devices in the office with i2c things on them, so i'm going to try testing with those
    i haven't done i2c with johnny-five though, so pointing me in the direction of how to get things setup would be great :)
    Matt Haines
    @beardedinventor
    can you show me what your i2c writes look like for the mpu6050 (either in Squirrel or in johnny-five)? might be something obvious like how you're sending addresses?
    Donovan Buck
    @dtex
    @beardedinventor Sure, but it’s read I’m wrestling with
    i2c_addr = pin[0] << 1; // where pin[0] = 0x68, the 7-bit address
register = “0x3B"; // Where 0x3B is the register address
numbytes = pin[2].tointeger(); // pin[2] = 14

local result = i2c.read(i2c_addr, register, numbytes);
    Writes are working really well already.
    Matt Haines
    @beardedinventor
    oh, sorry i read that totally wrong..
    Donovan Buck
    @dtex
    Oh wait a minute...
    register = “0x3B”; is actually register = 0x3B.tostring();
    So, all
    i2c_addr = pin[0] << 1;
register = 0x3B.tostring();
numbytes = pin[2].tointeger();

local result = i2c.read(i2c_addr, register, numbytes);
    Matt Haines
    @beardedinventor
    oh, geeze
    this should actually be an easy fix (for your squirrel)
    Donovan Buck
    @dtex
    :+1:
    Matt Haines
    @beardedinventor
    you want to change the register address you're reading from to "\x3B"
    Donovan Buck
    @dtex
    I’ve tried that, but I get this error when I do:
    2015-01-17 11:30:50 UTC-6    [Agent]    ERROR: cannot convert the string
2015-01-17 11:30:50 UTC-6    [Agent]    ERROR:   in unknown vimp:68
2015-01-17 11:30:50 UTC-6    [Agent]    ERROR:   from unknown overrides:3
2015-01-17 11:30:50 UTC-6    [Agent]    ERROR:   from unknown vimp:31
    Matt Haines
    @beardedinventor
    register = "\x3B";

    i think this should also work:

    register = 0x3B.tochar();

    Donovan Buck
    @dtex
    Both give me that error.
    This is weird:
    server.log(0x3B.tochar()); <— logs ```;```
server.log(0x3B.tostring()); <— logs ```59```
server.log(“\x3B"); <— logs ```;```
    Matt Haines
    @beardedinventor
    0x3B is treated as a number (just represented in hex)
    so server.log(0x3B.tostring()) is equivalent to server.log(59.tostring())
    whereas the \x00 notation (inside of quotes) is a way of building strings with hex bytes
    so you can do things like:
    local someString = "\x00\x01\x02";
    for i2c.read you want a string of characters (a ; in your case)
    Donovan Buck
    @dtex
    Got it, but I don’t see why I would get the cannot convert string with:
    local word = i2c.read(i2c_addr, "\x3B", numbytes);
    Matt Haines
    @beardedinventor
    neither do i :/ I have an identical line in my code (with the only difference being the addresses im reading from) and im not getting a string conversation error
    Donovan Buck
    @dtex
    Okay. All my stuff is still mixed in with Tyrion so let me whip up a Squirrel only approach and see if it still happens.
    Thank you for looking at this. I’ll post back tonight with the Squirrel only result
    Matt Haines
    @beardedinventor
    no problem :) i'll probably pop back in throughout the day, and also keep playing with this to see if i can figure out some johnny-five i2c stuff :)
    Matt Haines
    @beardedinventor
    @dtex - found what was going on
    register is being passed in as a string, so we need to .tointeger() it before we can .tochar() it
    (or rather, it was getting .tostring()'ed in the update function).. I updated it to look like this, and I'm getting expected results: 
    i2c_addr = pin[0] << 1;
register = pin[1];
numbytes = pin[2].tointeger();

local word = i2c.read(i2c_addr, register.tochar(), numbytes);
    Donovan Buck
    @dtex
    Awesome, thank you so much! I'm away from the computer right now but when I get home I'll fix it in Tyrion. I owe you one for sure.
    Derek Wheelden
    @frxnz
    @dtex I just finished setting up my imp. I've got the IR sensor and I just finished soldering headers to the Adafruit I2C PWM driver, so let me know if I can do anything with those to help you test
    Donovan Buck
    @dtex
    @beardedinventor Woo hoo, it works!
    @rwaldron I just need to add support for i2cReadOnce, some tests and I’m done. I also think I should explore passing the frequency to Tyrion since so many posts to the agent will never even be read.
    @frxnz It’d be helpful to test the PWM driver and make sure I didn’t break that while trying to get I2C reads working.
    Derek Wheelden
    @frxnz
    Can do. Is imp-io up to date or do you have a branch I should pull down?
    Donovan Buck
    @dtex
    You should use dtex/imp-io and dtex/Tyrion to test I2C
    Derek Wheelden
    @frxnz
    @dtex Testing the PWM driver now. Something doesn't seem quite right
    I got servo.sweep() to work once, but it the steps were kind of erratic. And now I can't get the servo to move
    Also, guessing you'll want to add this line:
    Imp.prototype.sendI2CConfig = Imp.prototype.i2cConfig;
    Derek Wheelden
    @frxnz
    It started working again, not sure what happened there. Here's a video of servo.sweep() weirdness https://www.dropbox.com/s/bvbkm8mwfpr085a/servo.mov?dl=0