Check the table below to find a time suitable for your project. This time is set when the board is powered up, so cycle power after you select your time. On the underside of the board are these letters and the amount of time that is set when the corresponding switch is flipped. To the left of the switch are five letters labeling each switch. The board has a six DIP switch that controls this time by changing resistance to the timer pin on the IC. The Nano Power Timer's main function is to turn your microcontroller on after a set amount of time, continuously. The tolerance of the resistors and margin of error makes it imprudent to try and use this product for HIGH precision applications. The resistor values on the board have a 1% tolerance as well. The example given in the datasheet is a desired 600 second time which would require a resistance that falls in the window: 56.96kΩ-57.44kΩ. Maximum current draw is 50 mA.įull Arduino description and specifications can be found here.Note: As reported in the datasheet, the resistance corresponding to the given time has a certain margin of error. A 3.3 volt supply generated by the on-board regulator. Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board. The board can be supplied with power either from the DC power jack (7 - 12V), the USB connector (5V), or the VIN pin of the board (7-12V). This pin outputs a regulated 5V from the regulator on the board. You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin. The input voltage to the Arduino board when it's using an external power source (as opposed to 5 volts from the USB connection or other regulated power source). If using more than 12V, the voltage regulator may overheat and damage the board. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable. The board can operate on an external supply of 6 to 20 volts. Leads from a battery can be inserted in the Gnd and Vin pin headers of the POWER connector. The adapter can be connected by plugging a 2.1mm center-positive plug into the board's power jack. The power source is selected automatically.Įxternal (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The Arduino Uno can be powered via the USB connection or with an external power supply.
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