[DSC_1239] This is a quick and dirty sketch of a temperature sensor running on a ATtiny 85. The ATtiny internally 8Mhz oscilator devided by 8 is used. Brown-out detection is set to 1.8V. The node has a fixed datarate and channel frequency, and sends the temperature data every minute goes to sle…

OK I thought to that you could use it to upload a bootloader :sunglasses:

Yeah, it is different for the ones with the ATtiny85 integrated into the board: https://nl.aliexpress.com/item/Free-shipping-Digispark-kickstarter-miniature-for-Arduino-usb-development-board-with-pins-and-Anti-static-bag/32222311445.html Those already have the bootloader installed and can be used …

there is an other one with an ATMEL167 (slightly bigger memory). Not testet, just ordered :wink:

https://www.thethingsnetwork.org/forum/uploads/default/original/2X/6/63387c838cf8d2e873a4295a32c39a59f98e2659.jpg theoretically this is a complete LoRaWAN temp/motion detector node :sunglasses: *picture updated with smaller capacitor :wink:

why such a big capacitor? buffering the current needed while sending? does it not constantly discharge the battery?

[image] ursm: why such a big capacitor? ohhh… he forgot to RTFx :unamused:

TinyLoRa-BME280 v1.1 I made some improvements based on the feedback from @jym with regard to the hardware interrupt from DIO0 pin. In v1.1 only PB3 and PB4 from the ATtiny are needed, no hassle with fuse bits changing the reset pin PB5. I also had some problems with the current of the BME280 draw…

Inspired by this forum, I made a node with ATtiny84 + RFM95W and BME280. I managed to get the current down to 4.8uA in sleep/power down mode. Remember to remove some pull up/pull down resistors on the BME280 bord. Due to the two modes (I2C and SPI) they are on that board. Perhaps you don’t need them…

Great! attiny85 is cute but I think 84 is much more interesting due to extra pins and cheaper price. any more details on your implementation ? chance to share code / hw design?

Extra pins is indeed the reason I choose this microprocessor and my experience with it of course. I will share my implementation and detail in a Blog I’m starting. I will announce the site here in a few weeks.

The Things Network

ATtiny85 + RFM95 Temperature Sensor

End Devices (Nodes)

tvloon (Tvloon) January 19, 2018, 2:01pm 35

ohhh… he forgot to RTFx