circuit for phone to power a stepper motor via bluetooth LE module

HI ! I think I have the better solution for you. THere is a chip from CSR named CSR1000/1. This already have the CPU inside which can handle a simple custom application - so there is no need for external Attiny. You only need a stepper motor driver, maybe with STEP/DIR inputs. The module I'm talking about has also GPIO which can be used for control the stepper driver. How many pieces do you need ? I mean do you need some production afterwards ? I have some modules with this chip but I can not have more- there is not a "comercial" product - so if you only need 1-2 pieces I can help you. The modules have about 12/10/2 mm I can do the FW for this module, including BLE part, conenctivity and stepper control, and you'll be able to control the motor via BT with some 'service' we can design or use a standard one. BR, Horia Pop

Dear, Colleague My offer is to use BLE112 module, which will handle anything. It has embedded 8051 MCU. My bid include: * circuit design; * PCB design; * SW development support; Optionally i can provide sample assembly. At the end you will reciev: * circuit drawing; * all files needed to assebmle units; Optionally: Working samples; Risky points - power consumption by motors by them self. BR, Jurijs

Hi, I went through your requirements, and I am confident that I can achieve the requirements with in your budget and schedule. I would love to work for your project. I am a professional product designer and a robotic hobbyist, i have a bachelor’s degree in Instrumentation and control engineering and possess an industrial experience in Electronics product design. I have designed many electronic products and have started working as a freelancer to find new challenges and solve them with my skills. I am very firm is Analog and digital electronics design, Embedded system design, Simulation and design tools and PCB layout tools. I also have skills in mechanical designs can work very confidently in AutoCAD. I have good understanding of vendors and can provide you sourcing support also. I can provide you complete end to end solution for the product, and ensure you quality of your desire. I do not believe in low cost for low quality, rather I prefer to invest on prototypes to get best quality product. I am a believer of quality and optimum cost. . Awaiting your reply Prashant