pral2a

How we tricked sand to think

From decisions to electronic logic

1. Computation as rule-following

Computers do not think. They follow instructions step by step to change information.

computation = applying rules reliably at scale

pral2a

/*
  ESP32-WROOM + HC-SR04 (x6) + Relays (x6) + Web UI + Persistent config + Debug logger

  Additions in this version:
  - Sensor->Relay mapping is configurable (one-to-one, one-to-many, many-to-one)
  - Mapping editor in Web UI (checkbox matrix), persisted in NVS (Preferences)
  - AUTO mode uses mapping: relayTarget[r] = OR( sensorState[s] for all mapped sensors->r )
  - /status includes sensors + relays + heartbeat (millis), UI refresh is 0.5s

  IMPORTANT ELECTRICAL NOTE:

pral2a

╔═══════════════════════════════════════════════════════════════════════════╗
║                    LLUM BARCELONA ·  SYSTEM MAP                           ║
║                    (robot · vision · sensing · light)                     ║
╚═══════════════════════════════════════════════════════════════════════════╝


                                ┌─────────────────────────────┐
                                │        HANDHELD REMOTE      │
                                │        ESP32                │

pral2a

pral2a

Hello,

The following is an informal collection of readings, tools, and platforms curated during the last two months by the Fab Lab Barcelona team. 📚

We plan to send a thought-provoking collection every 2-3 months. 🔄 The summary and clustering of the articles are automatically done by GPT using the Bing extension; errors are expected.

We hope you like it, and remember to check out our blog. 🌐

Articles and Studies 📖

pral2a

pral2a

#include <Wire.h>

/*
 * Set I2C Slave address
*/

#define I2C_SLAVE_ADDRESS 0x7
#define SENSOR A0

 

pral2a

ID	Name	Unit	RAW?
10	Battery SCK 1.1	(%)	N
14	BH1730FVC	(Lux)	N
15	MiCS-4514-NO2	(kOhm)	Y
16	MiCS-4514-CO	(kOhm)	Y
53	ICS43432 - Noise	(dBA)	N
55	SHT31 - Temperature	(ºC)	N
56	SHT31 - Humidity	(%)	N
58	MPL3115A2 - Barometric Pressure	(kPa)	N

pral2a

int const PIRpin = 2;
unsigned long previousMillis = 0;
const long interval = 2000;

int prevPinStatus = 0;
long presenceCounter = 0;

void setup() {
  Serial.begin(9600);
  pinMode(PIRpin, INPUT);

pral2a

/*
    ESP8266 example for tone via timer1
    Hardware: NodeMCU
    2018
    tone using Timer
*/

//define ITONE_CYCLE 2500000 // 1 second cycle in 1/16 CPU clock (1/5 µs) for 80 MHz
#define ITONE_CYCLE 5000000  // 1 second cycle in 1/16 CPU clock (1/5 µs) for 160 MHz