Search found 350 matches

by mcauser
Wed Feb 13, 2019 9:13 pm
Forum: ESP8266 boards
Topic: Lolin board erase everything from flash
Replies: 5
Views: 194

Re: Lolin board erase everything from flash

If you are worried about fire from a heater that is left on from a crashed board, I’d add a separate failsafe independent circuit which can sever the power in an emergency. Something as simple as an attiny + temp sensor + relay. Or maybe the all in one W1209 board. But it only has a small relay, so ...
by mcauser
Sun Feb 10, 2019 2:24 am
Forum: Other Boards
Topic: [STM32F103] - Porting MicroPython to the "BluePill" board
Replies: 16
Views: 8344

Re: [STM32F103] - Porting MicroPython to the "BluePill" board

I haven't touched it in a while, but I'd really like to get this one working: https://github.com/mcauser/BLUE_BUTTON_F103RET6 Costs 4x more than the $3 "Blue Pill", but gives you 512 KByte Flash over the 64 KByte on the blue pill and a bunch more features and IO. I gave it the name "Blue Button" as ...
by mcauser
Thu Jan 24, 2019 4:06 am
Forum: General Discussion and Questions
Topic: Sensing sound from a speaker
Replies: 9
Views: 264

Re: Sensing sound from a speaker

Sensing sound from a speaker -> Sensing RF from a doorbell transmitter Your doorbell button is most likely a cheap ASK/OOK transmitter, operating on either 315 or 433.92 MHz. I recently made an ESP8266 based project which listens for RF packets emitted from my doorbell and urequest posts them to a ...
by mcauser
Thu Jan 24, 2019 3:56 am
Forum: General Discussion and Questions
Topic: Charging 3,7v LiPo battery
Replies: 6
Views: 215

Re: Charging 3,7v LiPo battery

Another option is to use one of those 18650 power bricks. https://www.aliexpress.com/item/2017-New-Portable-Power-Bank-18650-External-Backup-Battery-Charger-With-Key-Chain-Factory-Price/32828507666.html Consisting of a micro-usb for charging, usb-a for powering your device and comes in various prett...
by mcauser
Thu Jan 24, 2019 3:46 am
Forum: Programs, Libraries and Tools
Topic: Using rpi-rf with ESP 8266
Replies: 2
Views: 85

Re: Using rpi-rf with ESP 8266

Not to be confused with rpitx, which is a hack that can turn a raspberry pi into a crude transmitter using nothing more than a GPIO pin (and a bandpass filter).
by mcauser
Thu Jan 24, 2019 3:44 am
Forum: Programs, Libraries and Tools
Topic: Using rpi-rf with ESP 8266
Replies: 2
Views: 85

Re: Using rpi-rf with ESP 8266

I recently built an ESP8266 project using two of those cheap ASK/OOK modules and couldn't find any suitable libraries. There's a few raspi / arduino libraries which add their own protocols which you could use for inspiration. eg. rpi-rf, rc-switch, radiohead, etc. For TX, depending on the complexity...
by mcauser
Thu Jan 24, 2019 3:27 am
Forum: ESP8266 boards
Topic: HOW TO PROTECT THE CODE?
Replies: 2
Views: 458

Re: HOW TO PROTECT THE CODE?

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by mcauser
Thu Jan 24, 2019 3:12 am
Forum: ESP8266 boards
Topic: Working with ESP8266 (ESP-07S)
Replies: 1
Views: 120

Re: Working with ESP8266 (ESP-07S)

Should be the same ESP8266EX chip in all of the ESP-xxx modules. Some are configured with more flash memory. Some expose additional pins. Some have a metal can / shielding. See http://esp8266.net/ for more specifics. IPEX / U.FL connectors are only rated for a small number of reconnects. Maybe 20-30...
by mcauser
Thu Jan 24, 2019 3:01 am
Forum: ESP8266 boards
Topic: Lolin board erase everything from flash
Replies: 5
Views: 194

Re: Lolin board erase everything from flash

Could you add a few 5.5V super capacitors acting as a battery/ups and monitor the voltage on the analog pin and flick a relay to power down the device once the voltage drops below a threshold? The relay would be wired normally open, and you'd have to bypass it to boot, but once booted, hold it close...