AGOpenGps success stories - Page 2 - The Combine Forum
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post #11 of 23 (permalink) Old 05-27-2019, 05:53 AM
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1984 Massey 4840 with centimeter precision seeding into last year's green manure crop.

Agopengps is breathing life into our old iron.

Also a pic of our solution for mounting the wheel angle sensor on an articulating tractor.

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post #12 of 23 (permalink) Old 05-27-2019, 09:54 AM
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Also a pic of our solution for mounting the wheel angle sensor on an articulating tractor.
Should upload that picture to the wiki if you get the chance

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post #13 of 23 (permalink) Old 05-28-2019, 12:15 AM
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A little clip of AgraBot. Did a couple thousand acres. Some me driving, some it. That makes it quite versatile.



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post #14 of 23 (permalink) Old 06-01-2019, 06:19 AM
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Kale planted at 0,8 km/h and pumpkin seeded at 2km/h, I am a very happy man. Days with 500+ minutes of NTRIP listening and Agopengps keeps going!
Should have picked bigger boxes, the wires make it into a mess. A reminder why the autosteer PCB is a great idea!
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post #15 of 23 (permalink) Old 06-18-2019, 05:04 AM Thread Starter
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stanlee - amazing ! thanks to ferenz for this...!

Questions on agopengps? Just look into the wiki at
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post #16 of 23 (permalink) Old 06-27-2019, 02:16 PM
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My 2nd attempt in the field this morning. I've only tried pure pursuit so far. See the pics and youtube video. Sorry for the shaky & blurry video, we don't have a camera tripod on the sprayer yet, ha ha.


AgOpenGPS Dev - 2019 06
Acer Switch Alpha 12
Arduino UNO w/ W5100 Ethernet shield
L298 motor controller
Piksi Multi GPS receiver w/ Freewave RTK radio
Old WRT router running DD-WRT firmware
Parker Proportional/Directional hydraulic valve

The Piksi GPS receiver was running RTK with correction coming from another Piksi at the farm yard (up to 2 miles away). The purpose of the WRT router is act as an ethernet switch for all the components and provide internet connectivity when close enough to the yard's wifi. The Parker valve is a single coil proportional & directional valve which needs about 1.4 amps at ~4.5 V to center, then +- from there to adjust the flow in the respective direction. The Arduino outputs a steady PWM to the L298 for centering the valve when not autosteering, and a variable PWM accordingly while autosteering. The Switch Alpha 12 tablet uses a 12V to 19V booster for charging/power and I use a passive PoE injector kit to send the 19V to the tablet.

The Parker valve seems to have a variable deadband in the middle so I compensate by setting my autosteer pid settings a little on the switchy side. This causes some GPS oscillations because wiggling the steering axle back and forth causes the front end to wiggle and I'm not using any terrain compensation so the rough terrain and air ride suspension add to the GPS fluctuations. My plan is to move to an arduSimple dual receiver setup in the future.
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post #17 of 23 (permalink) Old 06-28-2019, 04:10 AM Thread Starter
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cool machine! diy homemade?
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Questions on agopengps? Just look into the wiki at
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post #18 of 23 (permalink) Old 06-28-2019, 11:13 AM
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cool machine! diy homemade?
Very much DIY! This sprayer ran all day the past few days. The open cab bothers some people but we don't spray when it's windy, air conditioning would be nice sometimes though. We also like it as light weight as possible on the wet years.
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post #19 of 23 (permalink) Old 07-02-2019, 03:02 AM
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Spraying field that is seed drilled with AOG autosteer. Sprayer tractor hits perfect to tramlines. Steering is a bit restless because of too big valve.
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post #20 of 23 (permalink) Old 07-19-2019, 02:30 AM Thread Starter
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Thanks to Ferenz!!!!!


Questions on agopengps? Just look into the wiki at
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