You can use sleep mode, and have the mcu wake up at regular intervals (so you can turn the servo) and also whenever the user presses a button (so that you can turn on the lcd and respond to user commands). However, if you use your Arduino Uno, then although you can put the atmega328p to sleep, the USB-to-serial converter will still be drawing power. That's why I said you need a standalone system.You'll either need to power your mcu directly from a 3V to 5V battery (e.g. 3 x AA cells, if 4.5V signal is enough for your servos), or you'll need to use 6V or more battery and a micropower 5V regulator such as the MCP1702.
But won't the servo require continuous power and control pulses to hold any load they might it be trying to maintain? If so I don't think any 'sleep' mode would work well?
So comes another qn: is a 9V battery better or a 3 AA battery connected directly to the 5V pin of arduino better?
Quote from: retrolefty on Feb 12, 2013, 04:57 pmBut won't the servo require continuous power and control pulses to hold any load they might it be trying to maintain? If so I don't think any 'sleep' mode would work well?I thought servos only move when you send them pulses?
Quote from: kurtselva on Feb 12, 2013, 05:01 pmSo comes another qn: is a 9V battery better or a 3 AA battery connected directly to the 5V pin of arduino better?3 x AA will last a lot longer. But check that your LCD works OK on 4.5V.
http://data.energizer.com/ will give you typical capacities for alkaline batteries and the lithium versions of standard batteries. If you use rechargables, bear in mind that NiMH cells are about 1.2V not 1.5V, so you probably want to use 4 of them instead of 3.
No, the batteries are in series, so the capacity will be 2000mAh.
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