Hardware

Yes, it is possible and has been done. Use the ESP-gateway example sketch in the development branch on github.

@mfalkvidd, I'm glad it seems that I'm doing everything in theory and method correctly. Shows to myself that i have understood the principles properly. I think I'm correct in assuming/thinking the limitations are as I said in the previous post (post 4), however I would like a discussion regarding those to just confirm them so i know where and what i can do with this method of applying readVcc() to analogRead() to measure a voltage externally from the VCC line of the uC.

Firmware upload doesn't seem to work :-/ BR Jonas

@epierre I normally use a reflow oven and in your case I had to use a heat gun.

Hey @dakky how did you progress in building the housing? I would be happy to hear (of course also see) about your experiences since I am planing something very similar.

-- revisited --- I changed the bootloader to a 8mHz version. As the processor runs 8 times as fast the active period pulse width is now < 0.5 ms (earlier 3.8 ms) The sleep and active consumption have not changed. This would reduce the 'pulse' burden on the coin cell as attentively mentioned by @scalz. [image: 1457896553952-upload-49f13d13-d4ed-46aa-8576-a47e5f271d2e] Something comparable to 'internal resistance' increases as the charge reduces. This will impact the available voltage for the node. I used a conservative figure for battery capacity (50mAh) and a load current of 0.8uA which will be less if battery voltage goes down. [image: 1457897897595-upload-dae13a0d-52ee-46c3-b470-425dd5a225a0] [image: 1457898169118-upload-60cbec3f-4bb1-480a-a7a8-d5077d6b3f92] Have three nodes ready for real life test with constant battery measurement. I hope to report just within five years from now :zzz:

The channel width of the nrf is "less than 1MHz" when using 250kbps according to the preliminary specification. At 2mbit the width is 2MHz. Increasing/decreasing the channel with 1 will move the center of the channel 1MHz. Maybe separating the two networks with more than 1 channel is required?

New comments should be in the thread over in the open hardware section here

@Yveaux I used panasonic PIRs, they are hard to find and price ranges widely. I submitted the build last summer.

In clean air, I calculated the value of R0 by using MiCS quick evaluation board. Formula applied :(ADC/(RESOLUTION - ADC)) * 51820---for NO2 and (ADC/(ADC-RESOLUTION))*100820 -- for CO and in polluted air I applied same formula and gave it a name Rs Then took ratio of Rs/R0 which is less than one. So I had a slope and its constant meand y = m*x + c But i do not know how to derive equation to find out the value of ppm from Rs/0

Got my HLK-PM01in the other day so I removed the buck converter from my test board and added one of these and now it communicates fine. Thanks for the advice.

@Ironbar I did some test with the nrf24l01 the one that come with the pa + lna amplifier (100mw) and get more than a 1km on LOS. you may also try the RFM69HW.. the one that has 20dbm output.

i am going to try to build a sensor to with this option.. Is it working? And what sensor[s] do you have?

@shabba said: Has anyone tried the moteino or anarduino using mysensors? I am very tempted to press the buy button on one or the other. Pity they are so pricey but I am getting lazy to solder etc so I like having it all on one PCB :-) I have! I'm using a Moteino as a gateway with a non -H and that worked out of the box. I'm now building some sensors (including the outdoors in the PIR-light one) with -H versions. I bought these Moteinos without the RFM to avoid customs costs. If you do buy them without RFM; do not forget to insulate the bottom side of the RFM with PV-tape. I didn't, and I couldn't get it to work properly. Insulated and away it went! In short: Moteino works! Small form-factor, wide voltage input with own LDO and low-power is easy. Succes with your projects!

Thanks for the fast help... I´ll try the NodeMCU

I have now ordered these http://www.aliexpress.com/item/Free-shippin-10pcs-lot-Low-dropout-regulator-LDO-MCP1702T-3302E-CB-silk-HGCO-SOT-23-original/32592966949.html?shortkey=FZFfYj2M&addresstype=600 http://www.aliexpress.com/item/Free-shipping-10pcs-lot-MCP1702T-1802E-1202E-1502E-2502E-5002E-2802E-3002E-CB-MB-new-original/32565249742.html?shortkey=jyaMrA3M&addresstype=600

@AWI Thanks. I know understand what you meant. I am also concerned with the safety of not blowing or overheating the device. THat's why I referenced a link to a devicee above because there are several components which I don't really know whether I need it with resiestive loads or not.

@AWI Right - I have about 50 104 (100nF) in my stock - they are very typical for atmega projects. Thanks once again for your help