Audrino board
Audrino board
by limor
Wed Mar 07, 2007 10:45 am
JonHylands wrote:My brother pointed out that the Arduino Stamp comes with a 16 MHz crystal, so it should be compatible with using it as a bioloid sensor...
http://www.sparkfun.com/commerce/product_info.php?products_id=8164
- Jon
Don't know how I missed out on this module. RoboSavvy is a Sparkfun dealer (first shipment arriving today) so it would be great if this board can work as "the" Bioloid sensor board. On their site it says that the Audrino board can be powered by 9V input. Does it mean that it can tollerate the Bioloid bus power?
It regulates the power to 5V so it means that the gyro/accellerometers found on sparkfun can not be powered by its regulator since they are 3V.
by JonHylands
Wed Mar 07, 2007 1:23 pm
The board uses this voltage regulator:
LP2985AIM5-5.0 (there appears to be a typo in the schematic).
which, according to the data sheet for the regulator, can handle 16 volts max. I'm not sure why they say 9 volts max...
My brother took my code last night and loaded into his Arduino Stamp, and successfully toggled the LED (hooked to D3) using the bus WRITE_DATA commands.
The single-axis gyro board that Sparkfun sells (the analog ADXRS series) runs off 5 volts, so you could at least test using it.
You could also use one of these:
http://www.sparkfun.com/commerce/product_info.php?products_id=849
which is a 5 volt 2-axis accelerometer that outputs analog voltages.
- Jon
LP2985AIM5-5.0 (there appears to be a typo in the schematic).
which, according to the data sheet for the regulator, can handle 16 volts max. I'm not sure why they say 9 volts max...
My brother took my code last night and loaded into his Arduino Stamp, and successfully toggled the LED (hooked to D3) using the bus WRITE_DATA commands.
The single-axis gyro board that Sparkfun sells (the analog ADXRS series) runs off 5 volts, so you could at least test using it.
You could also use one of these:
http://www.sparkfun.com/commerce/product_info.php?products_id=849
which is a 5 volt 2-axis accelerometer that outputs analog voltages.
- Jon
by JonHylands
Wed Mar 07, 2007 4:28 pm
I talked to my brother again this morning regarding this board - it apparently has a big low ESR cap on the bottom of the board, which is only rated for 10v.
So, in order to use this board with the bioloid bus (which can go up to 12 volts when its plugged in), you would need an off-board regulator to provide 5 volts.
- Jon
So, in order to use this board with the bioloid bus (which can go up to 12 volts when its plugged in), you would need an off-board regulator to provide 5 volts.
- Jon
by pepperm
Wed Mar 07, 2007 10:34 pm
JonHylands wrote:So, in order to use this board with the bioloid bus (which can go up to 12 volts when its plugged in), you would need an off-board regulator to provide 5 volts.
- Jon
Maybe just change the cap, or remove it and put another on a daughter board across the AX-12 3 pin connector supply pins.
This board looks great, pretty much like the Orangutan but without the motor drive IC that we don't need.
Do you have any in stock yet Limor and how much would they be please?
I'll look at a daughter board.
Mark
by pepperm
Wed Mar 07, 2007 10:52 pm
I've just looked at the Arduino Mini schematic and the only capacitor on the input supply line is a 100nF decoupling capacitor. These usually have high voltage tolerances. The only low voltage rated capacitor is a 10uF 6V one across the regulated 5V supply. So I think this board should run off the CM-5 supply. The regulator may get hot though.
I'd love to try one all the same. At Sparkfun they are $36 which is about $5 dearer that the Orangutan but if it is available on Robosavvy that would be great.
We could use the boot loader too.
Mark
I'd love to try one all the same. At Sparkfun they are $36 which is about $5 dearer that the Orangutan but if it is available on Robosavvy that would be great.
We could use the boot loader too.
Mark
by limor
Thu Mar 08, 2007 3:02 pm
pepperm wrote:JonHylands wrote:So, in order to use this board with the bioloid bus (which can go up to 12 volts when its plugged in), you would need an off-board regulator to provide 5 volts.
- Jon
Maybe just change the cap, or remove it and put another on a daughter board across the AX-12 3 pin connector supply pins.
This board looks great, pretty much like the Orangutan but without the motor drive IC that we don't need.
Do you have any in stock yet Limor and how much would they be please?
I'll look at a daughter board.
Mark
It will take a couple of weeks to receive the Audrino Mini boards from Sparkfun. The cost at RoboSavvy Store will probably end up being around 25GBP (inc. VAT).
by limor
Thu Mar 08, 2007 4:25 pm
JonHylands wrote:The single-axis gyro board that Sparkfun sells (the analog ADXRS series) runs off 5 volts, so you could at least test using it.
You could also use one of these:
http://www.sparkfun.com/commerce/product_info.php?products_id=849
which is a 5 volt 2-axis accelerometer that outputs analog voltages.
- Jon
Another thing i havent tried but should work is to provide the Atmega pin called AREF with a voltage of 3.3V same as the voltage powering the sensor boards. So the Atmega would be powered by 5V but the AREF and the sensor boards can be powered by 3.3V.
The advantage of this is that you can use a cheap ($0.5) voltage regulator since the gyro/accelerometer dont consume lots of power.
by JonHylands
Thu Mar 08, 2007 9:24 pm
That's more or less what I'm doing, although because the single axis gyro is a 5-volt part, AREF has to be 5 volts. But I am using a "standard" LDO 3.3 volt regulator to provide power for the 5-axis board, and I'm just feeding the analog lines into the 5 volt A/D pins on the ATmega168. I lose almost one bit of resolution that way, but we're not using these IMUs for navigation - we're using them for balance, so even 9 bits should be good enough.
- Jon
- Jon