https://www.amazon.com/KICKPI-K2B-Development-Allwinner-Alternative/dp/B0DP64TCMM?

KICKPI K2B Single Board Computer, Allwinner H618 Quad Core 64 Bit D...

KICKPI K2B Single Board Computer Development Board, Allwinner H618 Quad Core 64 Bit Single Board Computer Up to 1.5GHz 2G LPDDR4 8G eMMC Support WiFi 5 and BT 5.2 Run Android 12.0/Ubuntu 2204

Jolly Lord of the Round Table•11/22/25, 7:30 AM

id still have to root it mostly

TTrueNorth https://www.amazon.com/KICKPI-K2B-Development-Allwinner-Alternative/dp/B0DP64TCM...

raptor•11/22/25, 7:31 AM

why does almost every sbc have "pi" as suffix

raptor•11/22/25, 7:31 AM

are they all trying to copy rpi?

TrueNorthOP•11/22/25, 7:33 AM

Well fyi one reason why some of the ones i sugest, is. 1 no sd card needed after first boot.
2, auto power on in power outtage.
3 chips shut down perferals for things not activly being use.

Jolly Lord of the Round Table•11/22/25, 7:34 AM

I think ill just get a pi3

TrueNorthOP•11/22/25, 7:38 AM

ok, get 10 or so cards.

TTrueNorth ok, get 10 or so cards. 😄

Jolly Lord of the Round Table•11/22/25, 7:42 AM

cards?

TrueNorthOP•11/22/25, 7:42 AM

yeh sd cards or micro cards

Jolly Lord of the Round Table•11/22/25, 7:44 AM

true lol
im gonna connect it with a 3tb hdd

Jolly Lord of the Round Table•11/22/25, 7:44 AM

aswell,and use the sd as a os and swap

TrueNorthOP•11/22/25, 7:46 AM

Right but its going to be ripping through them, I have been running pi labs for years, so You can get the very expensive cards, and they will last 3 a year, or a basic card and it will last about 1 a month to 1 every 3 months.

Lars•11/22/25, 8:57 AM

I want to buy some oled screens like those 0.96 ones. I’ve seen there are different types of those. Which ones should i order and where?

ren•11/22/25, 5:01 PM

Anything wrong with the 3 connections on the right? The LEDs arent burnt but they dont ligjt up, despise the first 2 lighting up just fine, theyre all connected the exact same way

ren•11/22/25, 5:01 PM

Rren Anything wrong with the 3 connections on the right? The LEDs arent burnt but the...

AnonEngineering•11/22/25, 5:01 PM

are the LEDs backwards?

ren•11/22/25, 5:01 PM

nope

ren•11/22/25, 5:02 PM

positive to the input volkt and negative to the resistor

AnonEngineering•11/22/25, 5:03 PM

so if you swap the one on the far right with the one on the far left it's always the right one that stays off?

AAnonEngineering so if you swap the one on the far right with the one on the far left it's always...

ren•11/22/25, 5:04 PM

the 3 LEDs from the right just dont light on
but if i swap with one of the working ones (1 and 2) they light up just fine

AnonEngineering•11/22/25, 5:05 PM

then somewhere you have an open circuit, either the +, the breadboard, the resistor, the ground...

AnonEngineering•11/22/25, 5:06 PM

a multimeter would be very helpful

ren•11/22/25, 5:07 PM

the problem seems to be in the gnd

ren•11/22/25, 5:07 PM

when i disconnected the greet jumpers right end

ren•11/22/25, 5:07 PM

and placed it right enxt to the resistance of any of the 3

AnonEngineering•11/22/25, 5:07 PM

you shouldn't have to need the bottom green and white wires

ren•11/22/25, 5:07 PM

it would light up

AAnonEngineering you shouldn't have to need the bottom green and white wires

ren•11/22/25, 5:08 PM

i do for some reason

AnonEngineering•11/22/25, 5:09 PM

the bottom rail is probably "open", perhaps too much current flowed through it at some point

ren•11/22/25, 5:10 PM

i switched it up and now only the middle doesnt work

ren•11/22/25, 5:10 PM

AnonEngineering•11/22/25, 5:10 PM

sounds like time for a new breadboard

AAnonEngineering sounds like time for a new breadboard

ren•11/22/25, 5:11 PM

this is a brand new one mane

ren•11/22/25, 5:11 PM

faah

ren•11/22/25, 5:12 PM

wait maybe

ren•11/22/25, 5:12 PM

the issue

ren•11/22/25, 5:12 PM

is wirht the middle's resistor

AnonEngineering•11/22/25, 5:12 PM

what happens if you pull that white jumper on the left out?

ren•11/22/25, 5:12 PM

lemme switch it

AAnonEngineering what happens if you pull that white jumper on the left out?

ren•11/22/25, 5:12 PM

the 4th and 5th dont work

ren•11/22/25, 5:12 PM

seems to be that there is something wrong i nthe middle

AnonEngineering•11/22/25, 5:12 PM

sure seems like that rail is shot

ren•11/22/25, 5:12 PM

cutting off the gnd's connection

ren•11/22/25, 5:14 PM

ok i switched one of the LEDs with one in the middle and all works well now (with the middle jumper existing

ren•11/22/25, 5:15 PM

seems like specifically that block is cooked

ren•11/22/25, 5:15 PM

well ill just get aroudn that with a jumper if ever needed

Deep Σcho•11/22/25, 7:35 PM

Hello! I need Help with my MQ-135 Sensor, i'm using this code, but the PPM doesn't match with the real PPM
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

const int mqPin = 14; // Pin where the MQ-135 sensor is connected (A0 -> GPIO15)
int valorSensor = 0; // Variable to store the analog reading

// Calibration parameters (adjust these)
float A = 500; // Start with an initial guess for A
float B = -2.5; // Start with an initial guess for B

LiquidCrystal_I2C lcd(0x27, 16, 2); // LCD initialization

void setup() {
Serial.begin(115200);
pinMode(mqPin, INPUT);

Wire.begin();
Wire.setClock(100000);

lcd.init();
lcd.clear();
lcd.backlight();

lcd.setCursor(0, 0);
lcd.print("CO2 PPM:");

delay(1000);
}

void loop() {
long suma = 0;
int cantidad = 10;

// Average sensor readings
for (int i = 0; i < cantidad; i++) {
suma += analogRead(mqPin);
delay(100);
}
valorSensor = suma / cantidad;

// Debugging: Print raw value
Serial.print("Raw sensor value: ");
Serial.println(valorSensor);

// Calculate PPM from the sensor value using calibration constants A and B
float ppmCO2 = A * pow(valorSensor / 1023.0, B);

// Debugging: Print calculated PPM
Serial.print("Calculated CO2 PPM: ");
Serial.println(ppmCO2);

// Update LCD with PPM value
lcd.setCursor(0, 1);
lcd.print("PPM: ");
lcd.print(ppmCO2);
lcd.print(" ");

delay(500);
}

Jolly Lord of the Round Table•11/22/25, 8:01 PM

are the arduino's analog pins well enough to record usb signals?

Jolly Lord of the Round Table•11/22/25, 8:01 PM

like if i kept the arduino between a usb from a pc to a keyboard

Jolly Lord of the Round Table•11/22/25, 8:01 PM

(also,arent those digital signals?could I use a digital pin to record them?)

https://www.amazon.com/KICKPI-K2B-Development-Allwinner-Alternative/dp/B0DP64TCMM?

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