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ARM vs Risc

History 1978

Mems vs Asic

ARM Cortex A vs ARM Cortex M


esp32 takes 3.3v. and uses an ams1117 to step down the 5v usb input used to first power the uart http://www.advanced-monolithic.com/pdf/ds1117.pdf https://www.mouser.com/c/semiconductors/power-management-ics/voltage-regulators-voltage-controllers/linear-voltage-regulators/?q=7805&package%20%2F%20case=TO-220

25 microns .025mm razor blade = 100 microns or .1mm 1 micron =~ 1k atoms


c=discharge rate

ESP Specific


https://www.youtube.com/watch?app=desktop&v=tQ0dL_9M1wI https://www.youtube.com/watch?v=BP1Dz66faf4 ESP32_NAT_Router

https://github.com/cnlohr/esp32-c3-playground https://github.com/cnlohr/esp32s2-cookbook/tree/master

compiled arduion code: go to File -> Preferences and then select Show verbose output during -> compilation. Finally, when you are compiling, the program will show you lots of data. At the last lines, you will find the path1 to the . hex file

Non-Light/Audio/Module Hardware

802.11 broadcast packets don't need wifi connection to be recieved so long as the reciever is on the channel

just the chip designs need to be fcc certified but the modules are ok

jst connectors are out. not enough current run through em

pcb screw terminals run a lot of resistance compared to butt connectors, bogo or soldering

pcv screw terminals produce a .22w power loss at 10Amps

r = 2.2milliohms. pl=2.2r*10a=.22w

Powering LEDS

100w LED strip which runs at 24v and needs 5 meters of cable this requires 4Amps of power. which require a wire of 0.75mm2 to transfer it over those 5 meters. If you however double feed the cable (from both ends) the requirement per cable is only ~2A so thinner cables can be used!

*Power distribution is never 100% equal and it’s good practice making sure both ends can handle the full load, maybe use 2/3rd of the thickness instead of half for instance

150leds or less use 2.0 under 300 go w 10amps dc barrel jacks 300 + go w AC DC converter

18 AWGauge, 0.75 mm^2, 3 core copper wire

Specification:Connectors:rated voltage: 0-36V;rated current: 0-5A. Extension wire: rated voltage:0-300V;rated current:0-2A

logic level shift 3.3 2 5v to ensure data signal doesnt get corrupted over long distances.

50a @ .05A each 5v LED or .03A 4 12V's

If I need the 60 per. thatd be 40amps needed.

Drive 1000LEDS w:

5v inject ever 5m 12v inject every 10m homerun injection - power supply runs wire to each injection point. parallel run - homerun till split and run inside multiple aluminum channels. inject using 22gague solid core and apply at begining and end of each strip 14gauge from 5v 40amp supply

connecting power injection lines from alternate power adapter from original will cause grounding problems.

power supplys should never connect

5v AC to DC Power Adapter Converter/ Transformer

BTF-LIGHTING DC5V Power Adapter 5V10A 50W- $22.99 5V3A 15W - $9.99 5V6A 30W - $15.99 5V8A 40W - $17.99


small, 2A 480Mbps small, 2.0 3A 480Mbps small 2A 480Mbps - not good for magsafe unless 15W input

gen2. @ 1000Mbps (10Gbps) (supports 4k), is 2x 3.0 & 20x 2.0 (novideo),

long, usba-usbc -> 3.0 gen2, 100W Fast Charging, not magsafe nor macbook long, usba-usbc -> 3.0 3->2.4A 500Mbps, long, usbc-usba -> 3.0 3A 500Mbps

Specification:Connectors:rated voltage: 0-36V;rated current: 0-5A. Extension wire: rated voltage:0-300V;rated current:0-2A

30x5 -> 150 = 3A/9a


leds should be further away from the diffuser than eachtoher to avoid brightspots.

average diffuser heights: 6.5 - 22% drop 13.5 16 - 36% less bright then no diffuser. spotless = 56% reduction

model U4 is best!


1018 - 15 - 46 1220 - 19 - 58 1220-3 - 18 - 56 1023 - 19 - 59 1616 - 16 - 55 1616s - 13-60

[1018 (1220s-3)] 1023 1616s 2020s https://ae01.alicdn.com/kf/Hf32caccc1db14c26a816422e69d9a71bz.jpg https://ae01.alicdn.com/kf/H821463ec18f54850b847715c9b71a2a9j.png

At full brighness(60mA) (20perRgb), 30Leds/Meter from a 5V uses 1.8 Amps. 5meters is the longest you can buy which would be 9Amps


27.87 -> BTF-LIGHTING 2 Pack WS2812B ECO RGB Alloy Wires 5050SMD Individual Addressable 8X32 256 Pixel LED Matrix. 37.99 for 2

5V power supply @ 20mah/60mah per pixel draw:

30x5m -> 150leds = 3A/9a

LED strip width:

30Leds/m = 32.9mm 60/m = 16.2 144/m= 6.6

1000? 750? 5-600 leds per nodemcu. all work but fps probs drop


background noise filtering (or squelch) Tge ESP32 uses a 12 bit ADC


A MAX4466 and INMP401 should average about 1875 on an ESP32, a MAX9814 about 1350 for all gain settings.


Analog or I2S Digital?

While providing a lot of functionality, the ESP8266 and the ESP32 boards (typical ones) we have been using, have experienced a lot of spurious noise on their ADC pins

Other Projects

guy on lighting board changing lights sends data to arduino via DMX shield. Arduino was INITIALLY connected to a laptop which would send data over wifi to main server which would send updates out via unicast to each of the badges in the concert hall. The central server would log every espthat connects to it for broadcasting. The Server ran in a container enviornment (a prox box stack). This was later changed LIVE during the event because w 1.3k esp's the channel utilization for the wifi 2.4ghz band range shot up to 86% (dropped packets b/c of all the back and forth comms) before switching to send out raw 802.11 packets (espnow esque) via ESP's. 3 esps on 3 different broadcast channels would do the unicasting after being directly connected to the arduino (Cutting out the laptop and central broadcast server). The dmx broadcasts an array of data corresponding to a lighting command. 20x/s. Can be an array of array [of lighting commands] -> the mac address would get modulod by 3 to sort which esp would be the broadcaster

2 batteries lasted 20 hours so they used sleep to keep it going for weeks (.3ma). every 30 seconds would wake up and look for the network. admin badges existsed. no ota