# Grade control

**URL:** <https://discourse.agopengps.com/t/grade-control/1702>\
**Category:** Project ideas - in progress\
**Created:** [14 April 2020 17:51 UTC](https://discourse.agopengps.com/t/grade-control/1702 "2020-04-14T17:51:12Z")\
**Posts on this page:** 20\
**Page:** 23

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**Author:** ![ChrisC](https://discourse.agopengps.com/letter_avatar_proxy/v4/letter/c/8baadc/32.png) [@ChrisC](https://discourse.agopengps.com/u/ChrisC)\
**Post date:** [24 November 2021 18:16 UTC](https://discourse.agopengps.com/t/grade-control/1702/442 "2021-11-24T18:16:24Z")

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To test they are all currently on a bread board…

I do have perf board that I am going to use for now since I haven’t designed a pcb… thats on the todo list

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**Author:** ![kansasfarmer](https://discourse.agopengps.com/user_avatar/discourse.agopengps.com/kansasfarmer/32/16265_2.png) [@kansasfarmer](https://discourse.agopengps.com/u/kansasfarmer)\
**Post date:** [24 November 2021 19:32 UTC](https://discourse.agopengps.com/t/grade-control/1702/443 "2021-11-24T19:32:34Z")

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Is their some way we could use a nano 33 IOT for this and go wireless?

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**Author:** ![nut](https://discourse.agopengps.com/user_avatar/discourse.agopengps.com/nut/32/1180_2.png) [@nut](https://discourse.agopengps.com/u/nut)\
**Post date:** [24 November 2021 20:53 UTC](https://discourse.agopengps.com/t/grade-control/1702/444 "2021-11-24T20:53:12Z")

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Could go with wifi or bluetooth module as well? Wireless antenna is on my todo list to get rid of the thin antenna cable dangling in the dirt…

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**Author:** ![ChrisC](https://discourse.agopengps.com/letter_avatar_proxy/v4/letter/c/8baadc/32.png) [@ChrisC](https://discourse.agopengps.com/u/ChrisC)\
**Post date:** [24 November 2021 21:56 UTC](https://discourse.agopengps.com/t/grade-control/1702/445 "2021-11-24T21:56:24Z")

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Have to look at the 4725 data sheet… the nano your talking about is 3.3v logic, not sure of the 4725 off hand… be careful with 5v around a 3.3v board

But having a quick glance at serial over Bluetooth protocol it seems pretty straight forward as a com port…

I may have to look into one of these with 5v logic to go bluetooth

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**Author:** ![SK21](https://discourse.agopengps.com/letter_avatar_proxy/v4/letter/s/d78d45/32.png) [@SK21](https://discourse.agopengps.com/u/SK21)\
**Post date:** [24 November 2021 22:24 UTC](https://discourse.agopengps.com/t/grade-control/1702/446 "2021-11-24T22:24:43Z")

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My experience with the Nano 33 is that it is not reliable. The wifi looses connection.

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**Author:** ![kansasfarmer](https://discourse.agopengps.com/user_avatar/discourse.agopengps.com/kansasfarmer/32/16265_2.png) [@kansasfarmer](https://discourse.agopengps.com/u/kansasfarmer)\
**Post date:** [26 November 2021 15:10 UTC](https://discourse.agopengps.com/t/grade-control/1702/447 "2021-11-26T15:10:13Z")

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I think ive got the parts i need now. A variety of PERF boards (never used these before) NANO, mcp6022 with a mounting socket, MCP4725 breakout module.

 ![DAC mockup.PNG](https://discourse.agopengps.com/uploads/default/original/2X/b/beba565300dc3b2c3deac762a9a2ed38f4ff1f4b.jpeg)

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**Author:** ![ChrisC](https://discourse.agopengps.com/letter_avatar_proxy/v4/letter/c/8baadc/32.png) [@ChrisC](https://discourse.agopengps.com/u/ChrisC)\
**Post date:** [26 November 2021 17:06 UTC](https://discourse.agopengps.com/t/grade-control/1702/448 "2021-11-26T17:06:28Z")

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Watch the pinout of the 6022… not sure if it’s the same

 ![20211024_202742](https://discourse.agopengps.com/uploads/default/original/2X/8/88d38139d0412bca147ff8ddf90655382a387778.jpeg)

Look at the plus and minus of the data sheet that hookup will be the same

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**Author:** ![kansasfarmer](https://discourse.agopengps.com/user_avatar/discourse.agopengps.com/kansasfarmer/32/16265_2.png) [@kansasfarmer](https://discourse.agopengps.com/u/kansasfarmer)\
**Post date:** [26 November 2021 20:14 UTC](https://discourse.agopengps.com/t/grade-control/1702/449 "2021-11-26T20:14:10Z")

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was hoping for more detailed shematic before i start soldering. Not sure if i understand how the 6022 is hooked up.

 ![mcp 6022](https://discourse.agopengps.com/uploads/default/original/2X/d/df30c65e3cf942135344857269a2df271b51609d.png)

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**Author:** ![ChrisC](https://discourse.agopengps.com/letter_avatar_proxy/v4/letter/c/8baadc/32.png) [@ChrisC](https://discourse.agopengps.com/u/ChrisC)\
**Post date:** [26 November 2021 20:36 UTC](https://discourse.agopengps.com/t/grade-control/1702/450 "2021-11-26T20:36:10Z")

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VoutA will be your output to machine as well as tied to VinA -

VinA+ will be tied to output of 4725

Vdd is 5v input.  
Vss is ground.

A 6022 has two opamps in the chip, will use the other side when we go to impliment lateral tilt/second scv

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**Author:** ![ChrisC](https://discourse.agopengps.com/letter_avatar_proxy/v4/letter/c/8baadc/32.png) [@ChrisC](https://discourse.agopengps.com/u/ChrisC)\
**Post date:** [27 November 2021 00:26 UTC](https://discourse.agopengps.com/t/grade-control/1702/451 "2021-11-27T00:26:15Z")

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Here is a quick pcb design… I plan on making some changes (double dac/opamp) for controlling 2 valves. but this will get you started.

 ![DAC PCB V1](https://discourse.agopengps.com/uploads/default/original/2X/f/f8289b553a00fd70ce40cbe2e84411998afeeb50.jpeg)

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**Author:** ![kansasfarmer](https://discourse.agopengps.com/user_avatar/discourse.agopengps.com/kansasfarmer/32/16265_2.png) [@kansasfarmer](https://discourse.agopengps.com/u/kansasfarmer)\
**Post date:** [27 November 2021 01:07 UTC](https://discourse.agopengps.com/t/grade-control/1702/452 "2021-11-27T01:07:14Z")

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![cris c pcb](https://discourse.agopengps.com/uploads/default/original/2X/0/041d0a12d3959a4cec8f679f120cd8ac59d7f837.jpeg)

So the 5V and GND are connected to the machines 5V and GND. Correct?

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<div class="post-metadata">

**Author:** ![ChrisC](https://discourse.agopengps.com/letter_avatar_proxy/v4/letter/c/8baadc/32.png) [@ChrisC](https://discourse.agopengps.com/u/ChrisC)\
**Post date:** [27 November 2021 01:51 UTC](https://discourse.agopengps.com/t/grade-control/1702/453 "2021-11-27T01:51:07Z")

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Yep… make sure you tie the machine 5v to VIN…  
this will make sure the power gets regulated, shouldn’t be an issue but its a safety measure.

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**Author:** ![kansasfarmer](https://discourse.agopengps.com/user_avatar/discourse.agopengps.com/kansasfarmer/32/16265_2.png) [@kansasfarmer](https://discourse.agopengps.com/u/kansasfarmer)\
**Post date:** [2 December 2021 14:12 UTC](https://discourse.agopengps.com/t/grade-control/1702/454 "2021-12-02T14:12:45Z")

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> [@ChrisC](#):
>
> Vdd is 5v input.  
> Vss is ground.

So do i need to hook these up your schematic doesnt show it?

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<div class="post-metadata">

**Author:** ![ChrisC](https://discourse.agopengps.com/letter_avatar_proxy/v4/letter/c/8baadc/32.png) [@ChrisC](https://discourse.agopengps.com/u/ChrisC)\
**Post date:** [2 December 2021 15:25 UTC](https://discourse.agopengps.com/t/grade-control/1702/455 "2021-12-02T15:25:20Z")

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Good thing I didn’t get one made up yet.

Yes those need to be hooked up.

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<div class="post-metadata">

**Author:** ![kansasfarmer](https://discourse.agopengps.com/user_avatar/discourse.agopengps.com/kansasfarmer/32/16265_2.png) [@kansasfarmer](https://discourse.agopengps.com/u/kansasfarmer)\
**Post date:** [3 December 2021 02:36 UTC](https://discourse.agopengps.com/t/grade-control/1702/456 "2021-12-03T02:36:37Z")

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if i feed 5V into vin on nano. Should i have 5v at the 5v on nano? Im getting 3.82 right now

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<div class="post-metadata">

**Author:** ![Pat](https://discourse.agopengps.com/letter_avatar_proxy/v4/letter/p/8491ac/32.png) [@Pat](https://discourse.agopengps.com/u/Pat)\
**Post date:** [3 December 2021 04:58 UTC](https://discourse.agopengps.com/t/grade-control/1702/457 "2021-12-03T04:58:52Z")

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yeah Vin is for 6v or more it goes trough a regulator.  
You should connect all 5V to the 5V pin.

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<div class="post-metadata">

**Author:** ![kansasfarmer](https://discourse.agopengps.com/user_avatar/discourse.agopengps.com/kansasfarmer/32/16265_2.png) [@kansasfarmer](https://discourse.agopengps.com/u/kansasfarmer)\
**Post date:** [3 December 2021 07:11 UTC](https://discourse.agopengps.com/t/grade-control/1702/458 "2021-12-03T07:11:05Z")

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So 5V from machine should go to 5V on nano not VIN?

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<div class="post-metadata">

**Author:** ![ChrisC](https://discourse.agopengps.com/letter_avatar_proxy/v4/letter/c/8baadc/32.png) [@ChrisC](https://discourse.agopengps.com/u/ChrisC)\
**Post date:** [3 December 2021 14:14 UTC](https://discourse.agopengps.com/t/grade-control/1702/459 "2021-12-03T14:14:47Z")

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Run it to 5v… or you can leave it off if you are powering through usb connection… just make sure everything is grounded to reduce the chance of grounding potential.

I would double check your 5v source, if it’s stable then you can put it on the 5v rail

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**Author:** ![BlackAce](https://discourse.agopengps.com/user_avatar/discourse.agopengps.com/blackace/32/7390_2.png) [@BlackAce](https://discourse.agopengps.com/u/BlackAce)\
**Post date:** [4 December 2021 23:59 UTC](https://discourse.agopengps.com/t/grade-control/1702/460 "2021-12-04T23:59:06Z")

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Hey Guys, wish I would have found this forum before I began working on my revision of the open grade program, it would have saved me a bit of time as many of the things I implemented have already been accomplished by members of this group! Live and learn! Anyways here is a few screen shots of what I have come up with. Seems to work generally on the same principle as the others with serial COM to a Microcontroller for automatic control. Biggest difference I can see is my use of modes; Ditching, Surface, and Tile. Currently I am working on an algorithm for automatic cut line creation, as I have seen it mentioned a couple times above. I didn’t see that someone had come up with the solution. If it has been created let me know so I can Focus my efforts on other features Users may like. [V3.0.1\_Ditch|690x486](https://discourse.agopengps.com/uploads/short-url/kj4p4gEQpZyk7ICtBTAWT5mbvwW.png)

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<div class="post-metadata">

**Author:** ![BlackAce](https://discourse.agopengps.com/user_avatar/discourse.agopengps.com/blackace/32/7390_2.png) [@BlackAce](https://discourse.agopengps.com/u/BlackAce)\
**Post date:** [4 December 2021 23:59 UTC](https://discourse.agopengps.com/t/grade-control/1702/461 "2021-12-04T23:59:44Z")

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![v3.0.1_Level](https://discourse.agopengps.com/uploads/default/original/2X/5/51af7c615e53b233ddb46fd96ea35eb0bc62c437.png)

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