Have you tested this with a Robomow RS630 2016 or 2019 model? Do you know the frequency they typically use? The perimeter switches are on backorder for a couple of months and they’re charging as much as $200 shipped.
We unfortunately didn’t try this perimeter wire kit with the Robomow RS630. Not sure if the frequency used for detecting the perimeter wire of the Robomow is an information that is available.
using this method… is there any way for the robot to detect if it crossed the wire already ? inside or outside ?
Unfortunately, with this method, there is no way for the robot to “know” if it’s inside or outside the surface delimited by the perimeter wire. Using this circuit will only let the robot detect the perimeter wire (or how far to the perimeter wire depending on the sensor output analog signal amplitude).
Hello,
Thanks a lot for the great article
I am building a robotic lawn mower, and would need a boundary/fence wire of about 300m (about 984 feet). Will one emitter be enough to power this wire? What was the largest wire length tested?
Best regards
The perimeter wire we used to test the generator circuit was 100’ long. This doesn’t mean that the wire can’t be longer.
From the datasheet of the NE555, the maximum recommended current output of the chip is 200mA. Therefore, with a VCC of 12V, the maximum power output would be 2.4 Watt.
So theoretically, the total output resistance should be less than 60 Ohms. There is an output resistance of 47 Ohms in the generator circuit, so it leaves 13 Ohms for the loop wire resistance.
A 20 AWG wire gauge is rated for 10.15 Ohms of resistance per 1000ft, therefore, the maximum theoretical length of the perimeter wire, would be approximately 1238’.
I bought a capacitor C5 with a polarity, I don’t know what terminal I should connect with IC, negative or positive terminal ?!
A polarized capacitor won’t work with the AC output of the generator circuit. A non-polarized cap is needed. It is better to use a ceramic one.
Is there any information of part sources like a datasheet for the inductors? I am trying to get some mechanical info such as dimensions to create a housing for both inductors.
Hi,
The Manufacturer SKU of these inductors is RLB0914-102KL. Here is the datasheet of these inductors. Also, the manufacturer provides an STP cad file that might help you when creating the housing.
Hi.
Thank you for this brilliant piece of art !
I have implemented the kit in my arduino robot lawnmower. It works beautifully. My perimeter wire is appx. 430 feet 2,5mm2 multistrand UL copper wire.
Though I do wish that the pickup distance could be a bit longer. I have 1-2 inches on inductor 1 before there is a tiny detection. Inductor 2 works up to 5-6 inches away.
- Why could this difference be ?
Several previous posts a stronger signal or longer pickup distance are mentioned. - Do you have a suggestion on how this could be done by external amplifier. Maybe an example or a sketch ?
Would more “grunt” on the wire give a stronger signal that could be picked up from a longer distance than 2-3 inches?
Anything would be appreciated. Thank you in advance !
Hi,
Thank you for your feedback. Happy to hear that you like the kit.
In theory, both inductors should have the same detection distance since the 2x inductors included in the kit are the same component (from the same manufacturer) and the signal detected on each channel is amplified the same way (also same gain).
- Could you verify that the components are soldered in the correct places on the sensor board (the 1M and 10K resistors specifically) ?
- Also, what power supply are you using on the generator board ? We suggest to increase the voltage (to a maximum of 15V) and the current to 3A.
- To improve the performance of the kit, you can also rotate the potentiometer on the generator board such as you have the longest distance between the inductor and the perimeter wire. This potentiometer varies the square wave frequency of the generator board from 32 698Hz to 43 956Hz as the resonance frequency of the tank circuit on the sensor board can vary due to the manufacturing tolerances of the components in use.
J’ai acheté le kit Générateur et capteur de fil de périmètre pour mon projet DIT robot-tondeuse et j’en suis très content ! Cependant avec 120 mètres (390 ft) de fil, le retour du signal est très faible ( quelques Millivolts) sur la carte de réception.
Est-ce possible d’augmenter la sensibilité en modifiant les inductances, remplacement du NE555 , remplacement de l’ampli ou modifier la tension d’alimentation.
Un nouveau Kit avec une longueur de fil périmétrique de 500 ft serait vraiment top !
Merci par avance pour votre réponse.
Bonjour,
Vous pouvez essayer ces deux suggestions:
- Augmenter le voltage d’alimentation de la carte du générateur (jusqu’à un maximum de 15V).
- Pour améliorer les performances du kit, vous pouvez également faire tourner le potentiomètre sur la carte du générateur de manière à ce que vous ayez la distance la plus longue entre l’inducteur et le câble périphérique. Ce potentiomètre fait varier la fréquence d’onde carrée de la carte du générateur de 32 698 Hz à 43 956 Hz, car la fréquence de résonance du circuit de réservoir sur la carte du capteur peut varier en raison des tolérances de fabrication des composants utilisés.
Bonjour.
Merci pour votre réponse. Je vais tester
Si jamais vous développez un projet du même type mais pour “grand périmètre”, n’hésitez pas à m’en faire part. Je suis intéressé !
Cordialement.
Il me semble effectivement que les boucles de robot tondeuse de grande maques soient alimentées en 24 V et permettent une meilleure détection.
Problème réglé ! L’ajustement du potentiomètre - sur site- a réglé mon problème de détection. Avec plus de 120m de câble périmétrique, j’arrive à le détecter à plus de 10 cm . C’est super. Merci
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I have been having issues with my landroid doing circles intermittently. I brought up the troubleshooting guide and it recommended replacing the perimeter wire. So I’ve completed that. It still does circles intermittently. So here I am. Next step is to order this kit and replace the components. Has anyone had success with this kit on a landroid? Thanks.
It would be better to look for a replacement that is made specifically for the Landroid. As the two systems are most probably different and won’t be compatible to work together.
Hello, I have built the same signal generator but I have an issue. When I check the frequency of the output after setting around 34k, I see that it swings between 33.9k and 34.1k. Is it about the quality of 1uF (C5)?