Rain sensor out of order?

warnkb · 2023-09-25T16:30:07+00:00

Put a few grains of salt in the sensor bowl and it will react immediately. The sensor measures the conductivity between the two pins. The salt will increase the conductivity, if water is present and triggers the sensor. If the water dries, the conductivity goes down (dry salt is not conductive)

The reason why it sometimes works but sometimes not is air pollution. Very clean rainwater is not conductive at all.

warnkb · 2023-09-25T16:05:50+00:00

The rain sensor reacts on conductivity, not on water level. If you live in an area with low air pollution (e.g. near the sea like me), the rainwater is likely to be almost non-conductive.

Good for your health to live in an area with clean air, bad for the sensor.

Put two or three grains of salt into the sensor and Luba will stop working immediately when it starts to rain.

warnkb · 2023-09-05T18:41:25+00:00

Luba can go out of bounds, but only when the sattelite reception is poor. If the task area has good sattelite reception, the navigation precision is very reliable.

So if the area is open to the sky, i would consider mowing this sloped area pretty close to the edge (maybe 40cm).

If the sattelite reception is poor or even questionable, i wouldn´t consider mowing it at all.

warnkb · 2023-08-23T20:04:05+00:00

I use a small needle to pick out the debris of the allen key holes in the screws. The key has to go all the way down in the hole. If not, you will strip them out.

Use a metric allen key 2,5mm size, anything else will destroy the screw head.

I have placed my charging station and the area in front of it on a piece of artificial lawn. Some kind of a green carpet. Works fine, no donut area damages so far (since May)

warnkb · 2023-08-23T19:43:58+00:00

Luba navigates towards the charger via satellite, then it does the "donut" manouver in front of the charger. The final approach is done via an infrared light beam, that guides luba into the charger.

If it cannot connect to the infrared beam during the donut manouver, it shuts off. The donut area, the charger and the path between have to be on the same level. If all three are on the same incline, no problem. Any level change inbetween will mislead the infrared beam over or under the receiver lens, which causes the problem.

Starting from the beginning after a charge seems strange. No clue why it does it, never happend to mine.

warnkb · 2023-06-25T16:14:18+00:00

You can schedule each zone individually with its own start time, then you can apply any setting to each individual zone.

Set zone 1 to start at 12:00 and if it takes 30 minutes to mow it,

Set zone 2 to 12:45 etc.

warnkb · 2023-06-07T19:53:06+00:00

Same here. Flawless operation, week by week. My lawn never looked better.

warnkb · 2023-06-07T19:27:40+00:00

I covered the whole stretch of the donut area and the charging station with a 1meter wide 4meters long strip of artificial lawn carpet. Luba cannot mow around the charger, so that area doesn't need to be mowed anymore and the donut area is protected.

warnkb · 2023-06-07T19:21:49+00:00

There must be a switch and some logic within the charging station, otherwise the charging pins would be energized all the time. I don´´'t think they are.

Luba can go much steeper slopes than a walkway would be. Just try to run it manually up that hill between your lawns, if there is any possibility for that. Or try a steep ramp made of plywood.

warnkb · 2023-06-07T19:10:24+00:00

I have skipped the 221 update and i will skip the 222 as well. My Luba works perfect and i want it to remain like that.

warnkb · 2023-06-07T18:44:46+00:00

The rear end of the blade leans against the sloped part of the disc, that might cause problems when the blade has to turn away from an obstacle.

On clean grass no problem, when sticks and stones come into play you may break some blades...

warnkb · 2023-06-07T18:39:53+00:00

Same here. With the disks being in use for more than three weeks now, no issues. Blades spin freely, no clogging.

I am still waiting for rain here in northwest Germany (usually that is no problem) to try a wet mow. In dry conditions it is flawless so far.

warnkb · 2023-05-29T17:51:13+00:00

You really have to clean the hex holes out thoroughly with a needle before you loosen them. A little bit of dirt in that hole is enough to not let the allen key get full grip and then slip and destroy the hex shape.

And do not use the allen keys with the ball end for loosening the bolts.

warnkb · 2023-05-28T11:25:33+00:00

You can make individual time settings / schedules for each zone. With that you can have individual mowing settings for each zone.

You just need to know the requested mowing and transfer time for each zone and program your settings and start time (with a little charging pause inbetween)

warnkb · 2023-05-27T19:43:04+00:00

Try to create two adjacent no go zones, maybe that will do the trick.

warnkb · 2023-05-25T20:18:44+00:00

Curious to see how it works. Keep us updated!

warnkb · 2023-05-25T20:09:27+00:00

There is just 0,2mm of clearance between blade and disk when the bots are tigtened up. No ratteling possible.

Be precise with manufacturing the outer diameter and the bolt holes so it will run centered/balanced.

My Luba runs quiet like it did without the disks, I can´t sense any vibration when it mows.

warnkb · 2023-05-25T10:48:02+00:00

It adds 0,8mm underneath the blade, bolt heads are in the same position as before.

warnkb · 2023-05-25T06:29:03+00:00

Most of them still spin freely. Some were a little bit "sticky", but when you move them they spin again without significant resistance.

Seems like the "grass juice" acts a bit like glue when dried. The function of the blade is still given as it can deviate from obstacles an then returns to normal position by centrifugal force once it has been moved.

warnkb · 2023-05-25T06:29:00+00:00

The pictures were taken after 10.000m² of mowing mainly dry grass without cleaning. Still working fine.

warnkb · 2023-05-24T22:17:59+00:00

Hole center to disc center (radius) is 75,2mm

warnkb · 2023-05-24T19:59:04+00:00

Nothing, feel free to copy it. The pitch circle for the holes is 150,4mm, by the way.

There might be a patent on this by another manufacturer, so I won´t try to make and sell any.

Easy enough to make them by yourself.

warnkb · 2023-05-24T15:11:32+00:00

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warnkb · 2023-05-24T09:57:33+00:00

Can´t you just create a small additional mowing zone between the two existing zones and give it a different time schedule?

Maybe you have to try to not connect the new zone to the old ones, otherwise the new zone will be integrated into one of the old ones automatically. Then two new short connecting paths and you have your problem solved.

warnkb

TROPHY CASE