Small Robot dog (quadruped)

Hardware

• ESP32
• IMU (not implemented)
• 12 servos TowerPro mg90d
• Two 18650

Software

• Arduino IDE compatible

TODO

• use power sensor and IMU

How to

Calibrate servos (create servoMainProfile)

• Print servo_calib tool and install servo into it: circle plate with dots, 10deg each from 0 to 180.
• use tools/servoCalib.ino and connect servo to 14 pin
• open Arduino IDE terminal and input 1500 (and press Enter) - this should be servo middle and it should point to the middle dot of printed tool
• decrease value to find minAngle and degMin values for it (start with 800 and decrease it until servo stop move, than return back one step, e.g. set 790 - servo moved, 780 - servo moved, 760 - servo don't move, use 780)
• do the same to find maxAngle and degMax but make value and start from 2100 and increase values
• great, now we know our servo limits (or at least what are the limits for lib+servo), time to find more accurate servo positions
• input values until you will not find proper positions for deg30, deg50...deg130, deg150

Legs

Assembling

• to assembly legs correctly print leg_calib tool/template one as it is and one mirrored for the other side of robot for Beta and Gamma angles, as also Alpha angle tool
• power up servo and connect ESP32 to you computer, open Arduino IDE terminal
• input set servo_to_calib to set all servo to position expected for printer tool
• assemble legs as closer as possible to expected leg parts positions according to the tool (90deg, 45deg, 90deg)

Calibration

• repeat steps 2,3 of Legs->Assembling instruction
• input set help to see the list of available commands, we are interested in XX_HAL_trim_xxxx, e.g. LF_HAL_trim_alpha, where LF - left front leg, and alpha is the angle name
• put Alpha leg tool on top of the robot legs servo, surface of tool should be (near)perfectly align with servos body, if not, use XX_HAL_trim_alpha value_in_deg command to set servo trim value, e.g. set LF_HAL_trim_alpha -3, it should not be too big, in other cases you need to repeat Assemble step
• using tool for Beta and Gamma angles, calibrate/trim other servos