![]() Just contact us within 30 days of the item's original shipping date to arrange for the return of your purchase. If we shipped you the wrong product, or it arrived defective or damaged All returns must be accompanied with a Return Merchandise Authorisation number (order number #). (The order shipment date and order notification are provided to you by email). You may return a product for refund or exchange (if due to our error) within 30 days of the order shipment date. ( Turkey > Brasil > Colombia, Paraguay or Peru) Because of that delays can happen. ![]() *Colombia, Paraguay, Peru shipments are sent over Brazil Postal Service. We are shipping to all over the world including your country too:) If your country is not in the list, don't be afraid. TIME TABLE FOR INTERNATIONAL REGISTERED AIR MAIL Below, these countries are the only examples. Registered Air Mail ( Fixed Price 9,95 USD, Free On Orders Over 199 USD)ĭHL Worldwide Express Shipment (Based on weight).So you will never be disappointed when you open our JSumo shipment box. Before shipment, we test all electronics and control the mechanics of all products. In my case a voltage source of 4.2v and the desired output of 3.3v.All products shipped with sealed in box. So to do this I used a voltage divider which uses a pair of resistor values to create a voltage value at a corresponding ratio. This is because I am running the ATTiny85 at 3.3v so that its IO is compatible with the Raspberry Pi IO. I needed a way to remap the high voltage into the range of the ATTiny85. Using the charged voltage of 4.2v and a minimum voltage of 2.84v in the following calculations. This includes its maximum voltage at full charge, its cutoff voltage, and the safe minimum voltage, along with how long the battery stays at different levels during operation.Ī good starting point is these tables of capacity to the voltage provided at the links below but I will also do my own testing as well. What we need to do to determine the battery life is to characterize the output of the battery over time. One is that they need to be monitored continuously since they can easily become unstable if they are discharged too low or stored at an improper voltage. This is due to their superior capacity can current supply, but this comes with some disadvantages. Lithium polymer batteries are almost the defacto battery that goes into portable devices. I2C and SPI interface shared with digital I/O.4 Analog inputs shared with digital I/O.Micro USB connector for easy programming.Atmel ATtiny85 processor running at 16.5MH.I decided to use this Arduino-compatible microcontroller board to monitor the voltage for several reasons, it’s small, cheap, has several Analog and digital IO, and it runs Arduino so others could easily create their own. So what we can do is map the charged voltage and the battery cutoff voltage of our battery to a 100% to 0% range. Batteries will cut out even sooner, for example, lipo batteries can become unstable, die, and become a safety hazard if they discharge too low. This is because almost all electronics won’t work at close to 0v as the voltage regulators that supply current will cut out. It would be nice if we could just monitor the voltage as it goes from like 5v to 0v but it’s not that easy. This can be solved by monitoring the voltage on the battery using an analog to digital converter, and then some firmware to read that digital value and produce a corresponding battery level. Portable projects require some kind of battery, but getting information on the voltage level or how much battery life you have left is a whole other problem.
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