See it on Hackaday https: //hackaday.io/project/4926-cheepit-sparrow-dev-boards-for-smartphones.When I saw the German version of this eBook first - I immediately liked the approach. Direct Programming / Flashing via the Audio Socket. For Mobile Phone - Tablet - PC.Many small applications are ready for download - all ready for download - flash - run - or edit for own purposes.Interfacing any hardware to a PC is getting more difficult, as the options have been reduced mostly to USB and wireless - Bluetooth or WiFi. Many people describe the engineering situation as frightening, too many engineers missing - including the next generation, as children are not getting into it at a young age, learn problem solving in electronics and like this as option for studies and later life in a professional career.So, who will design the big electronic systems?Having had the opportunity myself, from the age of about 12 years, helped me to take this decision - never regretted it. And still at it as you can see.The Maker scene allows for may options - but often the cost in schools is too high to give everybody a chance to play with the kit, getting taught how to approach it, and take the final running application home.Here, Burkhard and Thomas really got down to a minimum solution - basically reduced to an 8-pin microprocessor.And how can you write programs for it? No problem - all of the tools are online and ree of charge.When ready, the software is compiled to a Hex-file. This file is uploaded, and sent back as a sequence of sounds, taken from the headphone output of PC, tablet or mobile phone. An old Walkman might come back to life.Sharing is very easy as well - online or send on a sound file. And this sound gave the project its name: SparrowAdding to the material while translating was one option I had - but my choice was to keep it all as is, and rather go for some addition at the end to some MORE. I added a bit of material to the original Book contents where I thought it might help.Burkhard and Thomas kindly allowed me to translate it and publish it. At the same time, they gave me the option to modify the contents and add to it.This is already our third project project of this kind. The first one was Learning Programming with MyCo: Learning Programming easily - independent of a PCFollowed by the popular eBook: BBC micro: bit: Tests Tricks Secrets CodeWe hope you enjoy this eBook; and please help others to look by commenting on amazon.Many people have contributed their programming examples - and yours could be there as well.There are options to use as well a 2313 microcontroller for larger memory and more IO pins.After Assembler and C Compiler we hope to add a Forth Compiler as well, and there is a solution for the 2313 already; link to more info from the Forth Bookshelf at https: //www.amazon.co.uk/Juergen-Pintaske/e/B00N8HVE