(AMS1117 is not recommended, it draws too much power while standby) PNP transistorĪny normal PNP transistor, I have some SS8550 in hand. ESP BoardĪny ESP8266 board with SPI pin out should be ok, I am using ESP-12 this time.
Charge BoardĪny micro USB LiPo charge board that can compatible with your battery. In order to keep the circuit not draw over 1C current from the battery, it is recommended to choose a battery over 200 mAh. In my measure, this circuit sometime may draw over 200 mA. BatteryĪny LiPo battery a little bit smaller that the LCD should be ok. LCD DisplayĪny ili9341 LCD that can fit in the sweet box should be ok, I am using TM022HDH26 this time. Some can fit a 2.2 inch LCD and some bigger one can fit a 2.4 inch LCD with break out board. But beware it have many size, especially you bought it in different seasons and countries. Tic Tac is one of easy accessible transparent sweet box. If you found other useful situation, leave me a comment.WiFi Analyzer can help you detect this situation, normally restart the device wireless sharing function can switch to another random channel. Sometime it may hit a channel that already very busy and transfer file very slow. Portable device share file wirelessly by building temporary AP with a random channel.For example, in the above photo snap situation, channel 4 and 6 is much better than channel 11. if you can find a channel with lesser overlapping you should have better experience. If you need to use free WiFi in the street, you may choose one with strongest signal strength, but it is not always the fastest network.For example, in the above photo snap situation, channel 8 and 9 is much better than others. Choose a right channel for your AP is very important. That means the signal substantially overlapped and interference degrade the network performance. At my home and office, I can found over 20 AP SSID but 2.4 GHz only have 11 channels. WiFi everywhere now and 2.4 GHz is still most compatible frequency.WiFi Analyzer is very useful in some situations:
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