OnePlus One wireless charging

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Making PCBs with 3D printer

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I always wanted to make PCBs at home. I have tried most of the processes from the internet to make PCB-s (by hand with marker, with printer and glossy paper, ....). Recently I got 3D printer and thought that the precision should be enough to make simple PCBs with it. So I searched from internet and found this page: http://www.lamja.com/?p=635 I had some old rod from an old printer from scrap. Next I designed a rod holder that would fit the printer. The printer is modified Ender 3 and has new cooling. So the rod holder had to be designed from scratch. I found some usable size spring that I made a bit bigger. I tried the process with marker and it worked but the result was not very good. So I had a idea to use nail polish and scrape that off with the rod. I used some random old nail polish. This resulted much better PCB board than the marker. Other parts of the process are the same as the link above. I had some trouble to get the *.svg file to FlatCam, because FlatCam...
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ZTE MF29A router and Openwrt

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I got a MF29A router. I needed badly 3G router and with static ip leases, I was almost buying MR3420+3G stick. I cracked open the MF29A router, found some pins that were like serial port. Hooked up a serial port device and I was presented with bootlog. Stock firmware bootlog: U-Boot 1.1.3 (Feb 13 2012 - 16:50:17) Board: Ralink APSoC DRAM:  64 MB relocate_code Pointer at: 83fb0000 spi_wait_nsec: 1e spi device id: 1 2 16 4d 0 (2164d00) find flash: S25FL064P raspi_read: from:30000 len:1000 .raspi_read: from:30000 len:1000 .============================================ Ralink UBoot Version: 3.5.0.0 -------------------------------------------- ASIC 3352_MP (Port5<->None) DRAM_CONF_FROM: Boot-Strapping DRAM_TYPE: DDR2 DRAM_SIZE: 512 Mbits DRAM_WIDTH: 16 bits DRAM_TOTAL_WIDTH: 16 bits TOTAL_MEMORY_SIZE: 64 MBytes Flash component: SPI Flash FLASH_SIZE: 8 MB Date:Feb 13 2012  Time:16:50:17 ============================================ icache: s...
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Recently I had a problem when trying to program NodeMCU with Arduino. I flashed arduino with basically default pubsubclient test program. After programming NodeMCU connected successfully to Wifi, then tried to connect MQTT server and failed: WiFi connected Attempting MQTT connection...connected ............Attempting MQTT connection...connected ............Attempting MQTT connection...failed, rc=-2 try again in 5 seconds I researched and tested many Arduino scripts. All failed with the same error -2. I logged into the MQTT server and watched logs. The NodeMCU didn't even connect to the MQTT server. I was clueless. Luckily I bought a few NodeMCUs from different sellers. Opened up another NodeMCU and hooked it up. Flashed the exact same code to it and it connected and worked like charm. Then I tried to flash the first problematic NodeMCU with Arduino and exactly the same error -2. I had also a ESP12E that had the -2 error before. Flashed it with the same code, still error -2. ...
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