Thanks. I will keep that in mind. Well I will test and see...
Very passionate about electronics/hardware(especially digital electronics).
Posts made by mtiutiu
RE: 💬 RFM69W Raspberry PI Zero(W) Shield(HAT)
That's because of the issues that I had with the supply from the Livolo switches which is designed for low currents(several milliamps and even less). I had no luck with other solutions because of the high current consumption(more than 20mA) - and yes for the Livolo supply this is high. And because of that the stand-by power supply from Livolo crashed(burned) several times and I had to repair it(thanks to @tonnerre33 for his support on this part).
I know that other users managed to make this work with nrf24l01 radios and MySensors support but for me it didn't worked well and it wasn't stable - and trust me I studied the Livolo supply from outside to inside and I know its limitations and why it was designed the way it was designed.
RE: 💬 RFM69W Raspberry PI Zero(W) Shield(HAT)
Something like that. For now I'm doing some research to explore and know better the capabilities for such a setup. I had to learn BLE also (obviously) and now I'm playing with BLE Central(raspberry pi zero w board) to receive notifications from the BLE enabled Livolo switch.
But I'm also thinking to link everything over WiFi and MQTT as the high level "transport" because I will need a BLE central node for each room where a Livolo BLE switch resides. So I will see which fits and works best in the end: MySensors radio "transport" over RFM69W vs WiFi and MQTT...
As far as I know MySensors doesn't support a Linux node only a gateway...Initially I was thinking to use each Linux BLE central node as a MySensors node which has BLE Livolo switches attached as "sensors" but I'm not sure about that yet or if it will make sense ...
RE: 💬 NRF51822 Livolo 2 channel 1 way EU switch(VL-C700X-1_Ver_C2)
Hi, unfortunately I don't have time and patience for doing BOM's on all of my projects but in this case it's not very hard as the external component count is greatly reduced by using the NRF51822 RF SOC which is a PTR5518 module from Aliexpress. Other than that there is the Microchip touch sense controller - MTCH105 and the usual smd resistors(0603) and caps. Other than that you're not forced to use and solder the onboard dc-dc converter so you don't have to worry about those components - you just need to solder the 3V_EN jumper to use the Livolo 3V output coming from the main relays/power supply board.
RE: 💬 NRF51822 Livolo 1 channel 1 way EU switch(VL-C700X-1_Ver_C2)
Thanks. Well because it was cheaper/smaller than all of the Aliexpress modules found so far and it's shielded also(talking about the PTR5518 module here). So I found it to be perfect for this solution when this project was created(almost 2 months ago). Other than that nrf51 even if it's older or not so powerful than its nrf52 counterpart I found it to be more "mature" when it comes to the software part - just like atmega328p is for the Arduino world. If I remember well it was among the first one supported in sandeepmistry's nrf5 core: https://github.com/sandeepmistry/arduino-nRF5 or any other Arduino core for the nrf5xx modules so I assume its software support should be more richer than nrf52xxx.
RE: Recommendation for PCB fab?
Elecrow is a good fab imho and yes they are very generous - I received too my boards today and instead of 5pcs I received 11pcs . And this is not the first time they deliver more than requested. The price - 5$ for boards and 3.5$ shipping(standard mail) - 8.5$ in total. And yes they are the cheapest and pretty good quality pcbs - I'm very pleased about their services so far. They beat all the Chinese fabs including shipping so far(and the quality is pretty good - at least for what I need my pcbs for it's well beyond my expectations).
RE: SX1211/1212 based radio modules
I know that LORA modules require more TX time..but these are not specified as being LORA modules. Anyways that doesn't mean that your statement is not true - I didn't read all their specs in detail. I don't think TX current matters that much because usually transmissions are short because packets are short - we don't use Mysensors to send lots of data at once and it wasn't designed that way as far as I know. But yeah, it matters how fast the transmitter can do the modulation and which data rate is used.
SX1211/1212 based radio modules
Did someone saw or know more about these radios: http://www.semtech.com/wireless-rf/rf-transceivers/sx1212/ ? They seem really low power - I never seen such a low RX current(3mA) in active mode(no sleeping) so far on any radio module in the MySensors history . The radio modules used in this project take around 16mA in RX mode which is pretty much compared to the MCU current consumption(Atmega in most cases - around few milliamps or so).
When used in battery powered nodes this doesn't matter much I know but when used in circuits which should stay active and power requirements must be at a minimum then it matters: for example for the Livolo switch which uses a series power supply that cannot provide more than 5-10mA. This is just a simple thought.
The Semtech site even provides some libraries(written in C of course) as a starting point and some frequency hopping solution for use in a star network configuration based on these modules.