Category: Electronics
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Quick note on SEMTECH SX1276 100mW output mode
Few facts about SEMTECH SX1276 LoRa modem and 20dBm (100mW) mode: +20dBm (100mW) is possible only on PA_BOOST pin Pins RFO_LF and RFO_HF allows only up to +17dBm (50mW) Maximum allowed duty cycle while using +20dBm mode is 1% Maximum allowed VSWR while using +20dBm mode is 3:1 The biggest problem with +20dBm on PA_BOOST…
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Hands on: Tiny Frsky 8CH Receiver from Banggood
I have a nasty habit of buying things and then forgetting about them. Something like that happened to Tiny Frsky 8CH Receiver (Wolfbox F802 software compatible) from Banggood I’ve purchased last year. For some time I used it in JJPro P175 quadcopter, but then it landed in a box and I forgot about until last…
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Testing 868MHz LoRa range, part 2: open space
It was a good weekend. At least for me and CDEbyte E45-TTL-100 868MHz LoRa serial wireless modules based on SX1276. Why? Since weather was nice and looks like those modules are way better than datasheet specifies. Specs states: 3km in open space. And I’ve proven almost twice that much range! Last Friday I’ve placed one…
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Testing 868MHz LoRa range, part 1: urban area
With a (more less) free evening I decided to finally start testing range of 868MHz LoRa E45-TTL-100 radio modules I described only yesterday. Instead of building new testing rig, I only upgraded testing setup I used to test range of FS1000A and XY-MK-5V 433MHz radio modules. Few hours later I came up with this: I’ve…
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E45-TTL-100 868MHz LoRa wireless modules
My quest for ultimate (?) DIY telemetry system for UAVs continues. Last year I was playing with HC-12 433MHz wireless modules with pretty decent results. After all, more than 1km of range for a few bucks is more than acceptable. Still, HC-12 has at least few problems:
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FS1000A and XY-MK-5V second range test
Two months ago, when I published first FS1000A and XY-MK-5V range test, I was little surprised that I was able to reach 315 meters of stable connection. And I was almost sure, that they can do more. Having some free time during my summer vacation, I've left transmitter on a towel and took a walk…
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GPS Racer: worklog #8 – sonar test platform
I honestly admit, that my 6″ quad (codename GPS Racer) was never very pretty. It was just ugly with that GPS tower on the front. Today it got even uglier: I’ve equipped it with HC-SR04 sonar connected via I2C bus (ATtiny85 to the rescue). Why, you might ask, have I done something so useless? Answer…
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AnyFC F7 and DIY buzzer for INAV
Because both original and Banggood clone of AnyFC F7 flight controller and missing buzzer support, its usefulness is somehow limited. There is no dedicated pin and driver. Next release of INAV (1.7.2) will finally solve this problem by reusing Motor #9 output as buzzer output. But, some additional hardware will be required. To be precise,…
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FS1000A and XY-MK-5V, Arduino and VirtualWire
While FS1000A and XY-MK-5V 433MHz radio modules might not be the best choice in terms of quality, or reliability or distance (although few hundred meters in open space are doable), they have one very important trait: they are extremely easy to use. No complicated wiring, no advanced programming. If you want to send some data,…