What about using a Wi-Fi remote-controlled robot for exploring your surroundings, reaching inaccessible places, spying and take pictures?
Project tutorial by Igor Fonseca Albuquerque
A time switching battery powered solar charged circuit, used to power an Arduino Uno and some peripherals
Project in progress by Igor Fonseca Albuquerque
This project shows how to design a wi-fi remotely controlled two-wheeled robotic rover, using an Arduino Uno and an ESP8266.
Security system for bike riders with tracking and send alert features. In case of accident an alarm is sent with position.
Learn how to create a tide gauge that publishes tidal water levels to ThingSpeak and uses MATLAB for tide prediction, analysis, and alerts.
Project tutorial by MATLAB IoT
Jrobot adds wheels to mobile phone and makes it truly mobile. Jrobot on 4G has unlimited range and goes anywhere in the world.
Project showcase by joechen
I'm not sure if you can get the exact values (4 / 10 hours), but you may find something close to it.
You can simulate the circuit with different resistors and capacitors at the following website:
I've upgraded my robot, using some DC motors. Adding a servomotor to move the camera would be a great improvement! :D
Giovanni is right. You cand donwload a hobbist license and use it for a year at least.
Regarding the budget, it costed around USD30,00 + the smartphone.
Motors (x2) http://bit.ly/2h93K0J
Power bank http://bit.ly/2faJrmE
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