Database Info

Ohm's Law Calculator App for Electronics/Electrical Tools.

Ohm's Law Calculator for Electronics/Electrical Tools.
And For Electrical Engineering Education.
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Download on Google Play
https://play.google.com/store/apps/details?id=electronics.ohmslaw.calculator
Features
Ohm's Law Calculator. (Power ( W. ),Voltage ( V.), Current ( A.), Resistance ( Ω.)
12 Ohm's Law formula ( P = EI ,E = IR ,I = E/R, R = E/I and other)
Show Calculate Result on Graphics Display UI and Text.
Free Version with Ad.
Full Android Source Code.
Please contact [email protected]
My Web Blogs : Android Control External Hardware.
http://androidcontrol.blogspot.com/

Hi, might be useful for me since i am studying this, thanks.

Nice idea ..

Power bank with usb flash drive 2 in 1

Power bank with usb flash drive 2 in 1
Power bank modelower Bank with card reader
Battery:18650 Li-ion Battery
Material:ABS+PC
Color:Black, Silver, Blue, Red, Grey and Pink
Dimension:92*30*25 mm
Capacity:2800mah
InputC 5V, 800mA
OutputC 5V, 800mA
Support interface
Iphone4/4s/5,Ipad1/2/3 ,HTC ,Samsung ,Nokia and Smart phone, Digital Camera, Game Players, PSP, DV, BlueTooth, MP3/4/5 and all 5V device.
Connectorsne cable with three connectors(mini,micro,iPhone4)
Charge time:4 hours
Cycle life:≥500 times
Warranty:1 year
Certificates: CE, RoHS, FCC certificates, MSDS, UN38.3 testing report.
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Android and Arduino WiFi Control Devices with ESP8266 Module

Android and Arduino WiFi Control with ESP8266 Module
Arduino WiFi control App control your output devices ( relays ) with ESP8266 WiFi Module.
This is a basic Internet of things ( IoT ).
Feature
4 Digital Output Control ( Relay )
Control with WiFi Network
Change your device name
Free Version with Ad.
System Diagram
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Hardware
1.Arduino Board ( or compatible Board )
2.ESP8266 WiFi Module ( ESP-01)
3.Relay Board
4.Logic Converter ( we use resistor 4.7K and 2.7K )
Option
Regulator 5 V DC,LCD Display 16x2
Wiring Diagram
Android App on Google Play https://play.google.com/store/apps/details?id=arduino.wifi.control
More Info ( Arduino Code and more detail ) http://androidcontrol.blogspot.com/2015/05/arduino-wifi-control-with-esp8266-module.html

This could be very useful, i will try it tonight.

[APP][4.0.3+] dB Sound Meter App 1.2

Hi there !
Let's me introduce dB Sound Meter App
Main features;
- Gauge for indication current dB sound level
- Line chart for monitoring SPL changing
- Can calibrate the decibel for each devices
For calibration your device you have to find noiseless place at home (average ambient noise level is 30 dB ) and set value for correction in the calibration menu.
NOTE: App uses built-in microphone to measure ambient noise level. The maximum values can be limited by the device (often limit is in a range 80 dB - 90 dB ). Very loud sounds may not be recognized.
Some devices are equipped with AGC (Automatic Gain Control). This system causes additional sound pressure level measurement error.
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Force slow charging when battery reaches certain temperature

I'm developing a small utility which can automatically slow down charging when the battery overheats.(I know android does it automatically but I want to set the limit even lower.)
Currently, I turn off charging by `echo 0 > /sys/class/power_supply/battery/chargin_enabled` and then start charging again when battery cools down to a certain temperature.
- **Q.** Is there any way to control charging speed as well? (I can't write directly to `/sys/class/power_supply/battery/current_now`)
I know android automatically controls charging speed.
- **Q.** Is there any api to control charging speed?
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In android kernel source, I find `qcom,batt-warm-decidegc` interesting but couldn't find how to use it.
- **Q.** Can I somehow use `qcom,batt-warm-decidegc` in this case?