Bartosz Tomeczko varia

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DIY Roomba virtual wall (part 1)

Recently I got an iRobot Roomba as a gift (wedding gift to be precise). With the Roomba itself there was one Virtual Wall included. The idea of diving open area using the virtual wall is a really brilliant one. I quickly found out that I need more than just one such device for instance in the corridor where I have three doors (and which I would like to stay open during vacuuming). I quickly checked eBay et al. and found out that one Virtual Wall for my Roomba would cost ca 40 $USD plus the delivery cost. Therefore I decided to check it how it actually works and if it is possible to make a "Virtual Wall"-like device at my own.

 

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Sensor/actuator board

Finally I got some spare time to write something about first revision of sensor board (which will also act as an actutor board).

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Chinese H7 halogen bulbs

Why is it NOT wise to order safety-critical thingies from Chinese shops? Check it out.

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Receiver board

In recent days I found some interesting 2.4GHz transceivers on ebay.com ($1.30 each). Those modules are 3.3V capable of transmitting data at 2Mbps at maximal speed (0.25Mbps and 1Mbps are also possible options). They work in simplex mode. Main idea is to create a simple system for data acquisition from different sensors (like temperature, humidity, light, some binary sensors like flood sensor or door unlocked/locked). Later I also thought, that actuators could be driven using those modules. I started with receiver module, which is described in this article. 

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