Hello
I am trying to Using Arduino Mini 4 some environmental Moniotring. TMP102, HIH 4030 and and micro SD card to record data.
Can I use a 9V DC source as Power supply to Arduino MINI 4?
Is there a 5V ouput from Arduino Mini 4 like UNO?
Can I use TMP102, HIH4030 and Micro SD card interfaced to it with first source of 9V battery to Arduino and rest from Arduino to Sensor and Micro SD.
Regards
Sri
Yes, You can feed 9V to the board and you can use the 5V supply generated by the Arduino so long as the total current is less than 500mA.
The TMP101 only draws about 150uS and the HIH about 200-500uS. I don't know how much the SD card will draw, but I'd be shocked if it was too much. You should be fine powering those devices from the Arduino.
Steve
sdturner:
Yes, You can feed 9V to the board and you can use the 5V supply generated by the Arduino so long as the total current is less than 500mA.
No. The Mini is based on the LP2985 which has a maximum output of 150mA, not 500.
FYI, A SD Card can draw 65-75mA when reading or writing:
http://www.flashgenie.net/img/productmanualsdcardv2.2final.pdf
Thanks James, my mistake.
Steve and James
First of all thanks for your feedback. I understood. I have a 32312 Micro SD card Break outboard with reader.
http://www.parallax.com/Portals/0/Downloads/docs/prod/acc/32312-microSDCardAdapter-v1.0.pdf
Seems current consumption is 0.5mA current when in operation.
In the Arduino mini pin out configuration which pin should i take the 5V ouput from ? it seems there are many outputs from Mini 4?
can you help?
Sri
Sri_chikoo:
Seems current consumption is 0.5mA current when in operation.
That's not what the datasheet says:
Power requirements: 3.3 VDC; power consumption
determined by micro-SD card used + 0.5 mA when
card is inserted
The current consumed is whatever the card consumes PLUS 0.5mA on insert. So if it is 65-75mA like the SanDisk card I linked to earlier, the total consumption is 65.5-75.5mA.
hi James
you are right.
My Mistake.
Can help with MINI 4 and 3.3v required for the I2C device.
Sri
Youll need a 3v3 source (regulator) and use external pull-up resistors on A4 and A5. Ideally you should also turn off the internal pull-ups.
Hi James
So basically i need use a 3.3V voltage regulation as power inputs for my TMP102 and SD card.
Do I just need to use one pull up resistor for Each I2C line for both the devices?
Sri
Sri_chikoo:
So basically i need use a 3.3V voltage regulation as power inputs for my TMP102 and SD card.
That would be a good idea. I would also power that regulator off the 9V, not the Mini's 5V.
Sri_chikoo:
Do I just need to use one pull up resistor for Each I2C line for both the devices?
It depends on how far the devices are from each other. Generally only one (on SCL and one on SDA) is needed.