Boby is a playful little open‑source desktop robot arm designed to be easy, affordable, and fun to build. The entire project uses just three good‑quality SG90 servos—avoid the ultra‑cheap ones for better precision—and three standard potentiometers for manual control. Altogether, the full build comes to roughly $30, making Billy an accessible and enjoyable DIY robotics project for anyone who wants to experiment, learn, or simply create something charming for their desk.

read the pdf for code and schema

the servo i used :https://www.amazon.ca/-/fr/ACEIRMC-servomoteurs-Micro-h%C3%A9licopt%C3%A8re-t%C3%A9l%C3%A9commande/dp/B0BMFY8SX8/ref=asc_df_B0BMFY8SX8?mcid=00d9fa0ffb70385a8e168916a6508869&tag=cafrdeshadgo-20&linkCode=df0&hvadid=724304002684&hvpos=&hvnetw=g&hvrand=7455970091895348581&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9212253&hvtargid=pla-2000127627967&psc=1&language=fr_CA&gad_source=1

the potentiometer i used :https://www.amazon.ca/-/fr/Multitour-D%C3%A9broussailleuse-Potentiom%C3%A8tre-Lin%C3%A9aires-Pr%C3%A9cision/dp/B07ZKK6T8S/ref=rvi_d_sccl_12/134-6247484-3442233?pd_rd_w=f4d8J&content-id=amzn1.sym.8b4d8c20-8e51-4634-a76f-c00a1995a502&pf_rd_p=8b4d8c20-8e51-4634-a76f-c00a1995a502&pf_rd_r=4FX8M761CW734SPYC9NR&pd_rd_wg=pjE5G&pd_rd_r=3d04d376-f521-428f-a5c8-896b1e7b2922&pd_rd_i=B07ZKK6T8S&th=1