Hardware

@ehome If you need a minimum range of 5-7m have you thought of radar? https://forum.mysensors.org/topic/3568/microwave-radar-module-as-pir-replacement/36

This is the AC light dimmer on the picture. I wonder how to use interrupts to detect cross-zero voltage and manage radio communication.

not sure about in sleep mode. But here is the sensor i am using. https://smile.amazon.com/gp/product/B00Q9YBIJI/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

@mainali said in INA219 DC Current Sensor: MySensor gw; I am building similar system. However, i am facing a lot of difficulties to make the ACS712 working. I have tried your code as well without success. The effective value of the current is always 0 mA even if the light is ON. For the moment, i am testing with 5V current and i switch on a LED. maybe the current is too low to make working my 20A ACS712? If anyone has some ideas, it will be very greatful :) Thanks a lot.

@yveaux thank you for reply, i dont have any arduino with led to test this :) all boards are in use and without led may be i'll order few to test this at some stage.

@janerik I'm not sure what you mean by "a CC110x module without RF stage", as the CC110x is the RF part (for panstamps as well as other systems). Do you only use the driver or do you use panstamp HW as well ? Do you use SWAP ? I've been using panstamps with SWAP for more than 5 years now, indor but in a humid environment (pool), and I didn't notice this. My DHT22 sensor (on "sensor" board, going 6 month with a single AA cell !) stopped measuring humidity a few months ago, but the board (and the temp part) is still working without any hiccup.

but that is a mqtt gateway sketch. That is not a normal node. Have you tried making a normal node with nrf24 radio only, no gw functions?

This: https://www.amazon.com/gp/product/B00NTQYUA8/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 I use it as the UPS for a Raspberry Pi running Octoprint. The built-in 5v USB connector is enough to run the Raspberry. And you get surge protection too. Ooops. I just noticed that you meant for the nodes, not for the gateway. Sorry. A lot of sensor nodes can run for many years, maybe even decades, on just two or three AAA's. It's rarely an issue if they're well designed.

@isaac-ng said in ToF for scanning doesnt work as desired: vl6180x I've not used this particular sensor, but judging from the datasheet it uses IR led illumination and has a 42 degree field-of-view (http://www.st.com/content/ccc/resource/technical/document/datasheet/c4/11/28/86/e6/26/44/b3/DM00112632.pdf/files/DM00112632.pdf/jcr:content/translations/en.DM00112632.pdf, chapter 2.10.1). It probably 'averages' the distances measured withing its field-of-view, causing a gradual transition from distance 1 to distance 2. If you really need a step response in the measured distance you'd likely need a sensor with a very small field-of-view, e.g. a laser bundle. On the other hand, the point with the maximum slope in the transition from 1 to 2 will probably be very close to the actual step in your shape.

@sundberg84 not looking to do hi-fi sound, mainly to amplify an alarm or something simple.

@alexsh1 These boards support the Jlink (Segger) environment. The Segger firmware is available for windows, linux and MacOS..https://www.segger.com/downloads/jlink/#J-LinkSoftwareAndDocumentationPa

@ninkasi @raptorjr Consider the use of resQ tape. Not sure if this is available world-wide, but the use of it is very versatile. I've used heat shrink with and without the glue layer inside. Works for some time, but water gets in. Only the resQ tape has proven to keep the joints (cable entries of the connectors) watertight! See this video: https://www.youtube.com/watch?v=7f2XAiQHtzU BR, Boozz

@ybirch Hi did you see the post I posted? https://forum.mysensors.org/topic/9313/water-pressure-sensors/30 cost efficient, use a salvaged refrigerator compressor and purchase a long aqaurium airpump hose and a pressure transducer - might be fairly cheap

Non-invasive current measurement with HMC5883L is as good as mosquito killing by the hammer - can be done but an overkill! :-) Non-invasive current measurements are greatly done with wire clamp/loops. HMC5883L is highly sensitive and low noise digital compass. It can be used in drones, smartphones, VR sets - any applications that needs to know change of physical object orientation in 3D space. We use it for vehicle detection sensor. Did a benchmark on RMS on temperature stability with half a dozen of other sensors, ST, NXP, Bosch. HMC is the best! :-)

@voslogin did you have any success with this? I'm awaiting delivery of one, was hoping to do the same.

@dbemowsk original query was for a sliding gate. Anything else I would say just use 2 pairs of microswitches and if there is any ambiguity, drive direction until a change is noted. Keep it simple.

@johnrob Be careful. nRF24 radios are easy to blow if you feed them 5V for power.