I noticed a post talking about plugging the seat motor available in the KoP and First Choice into the rio as an encoder. Has anybody been able to plug this into the SRX breakout board? Also, how accurate is the encoder? We are using it for a small arm so I’m wondering if using a string pot or something may be more accurate.
*Title should say “Seat”, on my phone and stupid auto correct.
The concern for the encoder is I want to say I saw somewhere someone said they were putting out like 9 volts with the encoder, which exceeds the breakout boards from my knowledge (some can barely handle 5 volts). Would it be better to go with a string pot in your opinion?
The seat motor encoder circuit with not put out any more than your input between pins 2 & 4. It is isolated from the power circuit in the motor. Make sure you hook it up according to the motor spec sheet. If you apply lets say 5V then each pulse will vary between ~5V and drop to something on the order of 3.5V. The hall circuit (between pin2 and pin4) basically just creates a voltage drop each time the armature rotates.
Most teams I’ve heard from have verified reading hall counts through the analog RoboRIO inputs but I have yet to hear anyone utilize through the SRX. It’s on my list to check out with help of our programming team but waiting for the end of season crunch to die down.
For any who were still tracking this thread or interested in using the Bosch seat motor, AndyMark has come out with a $5 kit to convert the Bosch output to something more DIO compatible.
Just be aware this is a kit that needs to be soldered and it is pretty small. I had an advance kit sent and had our electrical students (team 862) test assemble a few boards. Just take care to solder the transistors before anything else so you can easily de-solder if bridging occurs. That was a typical issue. The leads are really close together on the transistors.
I’m curious if the kit is something like the link in this post.
Would you be willing to post a list of the components and a photo of each side of the board?
The link to the part on the AM site shows both in the download area. I wouldn’t say it is like the Schmitt trigger circuit that we were discussing. It’s a simpler version that uses 3 resistors. What I initially proposed to them was using an an opp amp comparator and they came up a simpler way of doing it. This can also be done with 1 mosfet and some resistors.