Asked

Does anyone know how to make a 270 degree servo move 270 degrees? I purchased some 35kg TD-8135MG 270 degree servos from China and they turned up this week so I put them in a robot arm. Most only need 180 degrees but the one on the base needs to move 270 to put the item on back of roomba so it is stable when moving.
is there a way to override setting in ARC to support 270 degrees?
Related Hardware EZ-B IoTiny
ARC's EZB' PWM protocol is limited to 180 degrees.
Two options:
1) Custom firmware (Arduino)
2) EZB + servo board.
I found this specs:
https://nenovtechnic.eu/electronics/td-8135mg-waterproof-35kg-180-degree-large-torque-digital-coreless-servo.html
It's a 180 degrees using the standard range 500-1500-2500 us.
Hey DJ remember when we used to get points for answering questions and we could buy stuff. How about points towards subscription fees
Pick an arduino firmware and change the attach method:
https://www.arduino.cc/reference/en/libraries/servo/attach/
Then send 1, 90, 180 to test the limits of your servo.Code:
,arduino, etc just added an abstract value to the pwm range so it appears a standard servo has 180 degrees
So many robot companies have spent hundreds of millions of dollars and bankrupted. Meanwhile you’re sitting at home doing more than they ever did lol. It’s awesome
I was hoping during covid that we’d see a bunch of useful robot products - also from this community. There’s a higher usage than normal of ARC but not many products in development.
I feel like it’s related to lack of hardware - and as you said, the cost is too high for what is available.
Maybe 2021 is the year? The media has been saying that for many years this is the year of robots LOL. Okay I’ve done my part by making robots super easy to program, now someone has to take care of the hardware! Anyone?! LOL
A cost effective robot hardware platform , either assembled or in kit form, that can actually be useful in the home is something Ive wanted to do for sometime, like giving arms and legs to an Alexa. A basic off the shelf platform for "some" basic simple home maneuvers. Which of course would require a quick easy to do navigation setup for the home that the robot will reside in. Just getting it to take the trash bag to the trash can would be money maker alone I think. Carry grocery's, home sentry, some education and entertainment function, verbal companionship, would be some other great features, who knows... can buy your home robot from Sharper Image, Best Buy or Walmart in the future
All the best
skidroe
Alan
I'm not using ARC on this robot (or I would have started a new thread about the tof sensors), if you look at the side view picture you'll notice a raspberry pi zero WH which is small, cheap, easy to power up and easy to code. The Tof10120 uses serial (9600,8,N,1) which I use for setting up the sensor or i2c which I use for reading the sensor as a serial read will return a string ie 'L=1000mm' whereas the i2c returns a high and low byte ie (high x 256) + low millimeters. Also the default setting on the 10120 is active reading which means it automatically sends a serial distance every 100ms (this frequency is adjustable) but I have set mine to passive reading which will only supply a distance when requested. The sensor operates on both 3.3v and 5v.
Steve
Thanks. I imagine I could do something to get the data from the Pi into ARC (mqqt or something), but I have other priorities for now. Good to know about the possibilities though.
Alan
EzAng
Now if only I could work out how to make the roomba find its base when it is all of 6 inches away and pointed directly at the base without having it go crazy running around the room and smashing into everything first.