The project's challenge - build an IuT instrument for breadboard users (circuit designers, tinkerers, students, makers) at low cost
What will it address - the need for measuring/monitoring several voltages during circuit prototyping, tuning and evaluation
How will it change the world - every person who builds the IuT voltmeter will spend a few dollars on parts, which is good for the global economy. The side effect is productivity and convenience increases for the user.
Project licensing - some permissive open source license (MIT?); contributions of other people will be acknowledged, and relevant license(s) stated as appropriate.
- usable straight away with any mobile phone or tablet etc, equipped with a web browser, with automatic refreshes of the measured voltage(s)
- fully self contained (no need to connect to any additional network)
- use of inexpensive ESP8266 then ESP8285 modules for implementing both a web server and an access point
- use of ADS1x15 module for voltage measurements
- protect inputs of ADS1x15 from overvoltage with resistors in series (no damage if the voltmeter's input is connected to a voltage source of up to 50 V)
- rechargable Li-ion battery for powering the device (to be capable of 4 hour operation without recharging it; allows for operating the IuT voltmeter independently of the breadbord circuit's power supply and does not require earthing of the volmeter similarly to a conventional DMM);
- have three hardware revisions (design based on WeMos mini base board and shields and ADS1x15 module; replacement of the original Li-ion management shield with more power efficient modules as a custom shield; PCB for permanent assembly of the device using custom modules)
- ESP82xx is to be programmed in Lua (NodeMCU firmware) for the ease of development and debugging at first; other options may be used to improve operation of the functional design at later stages if desirable