A open source scope for Android, with Microchip PIC or Arduino compatible hardware.

• Multi-touch support to modify visualization parameters.
• Ability to pause signal acquisition.
• Real-time FFT using JTransforms library:

Signal sources:

• Internal generator
• Microphone
• PIC based hardware
• Arduino based hardware

Software is available at Google Play for any Android 4.0.3 device or above with USB host module enabled.

Was tested on the following devices:

• Nexus 7 (2012)
• Samsung Galaxy Note II
• Samsung Galaxy S4
• Sony Xperia Z
• Android TV dongle MK919

Hardware can be divided in two sections:

• analog and signal adapter interface;
• ADC and microcontroller.

Two different microcontrollers can be used, one based on a Microchip PIC 18F or an Arduino Nano (Atmega328). Integrated ADC is used to convert analog signals, but a external and more powerfull ADC could be used to achive higher sample rates.

Thanks to this interface, Androidscope can measure:

• AC/DC signals
• Frecuency between 10Hz and 20kHz
• Max amplitude: 40 Volts peak to peak
• Protection: 100 Volts peak to peak

Frecuency response was measured on the Lab, and can be improved tweaking capacitor values:

This is a comparision between an oscilloscope and Androidscope using the Arduino based board, created on the Lab measuring a 1kHz, 20 volts square signal: