stable lcd scrolling

build/screen.js

@@ -1,23 +1,52 @@
 import { PrismaClient } from "@prisma/client";
 const prisma = new PrismaClient();
 import LCD from "raspberrypi-liquid-crystal";
+const timer = (ms) => new Promise((res) => setTimeout(res, ms));
 const lcd = new LCD(1, 0x27, 16, 2);
+const tag = "                Black Portal 1234 E Davison, Detroit Michigan";
 lcd.beginSync();
 lcd.clearSync();
-lcd.printSync('Black');
-lcd.setCursorSync(0, 1);
-lcd.printSync('Portal');
-setInterval(async () => {
+let tagCount = 0;
+setInterval(() => {
+    lcd.printLineSync(1, "                ");
+    setTimeout(() => {
+        lcd.printLineSync(1, tag.substring(tagCount, 16 + tagCount));
+    }, 50);
+    tagCount++;
+    if (tagCount > tag.length) {
+        tagCount = 0;
+    }
+}, 500);
+const getStanza = async () => {
     const stanzaCount = await prisma.stanza.count();
     const skip = Math.floor(Math.random() * stanzaCount);
     const randomStanza = await prisma.stanza.findMany({
-        take: 1,
         skip: skip,
+        take: 1,
     });
-    if (randomStanza) {
-        lcd.clearSync();
-        lcd.printSync(randomStanza[0].text.substring(0, 16));
-        lcd.setCursorSync(0, 1);
-        lcd.printSync(randomStanza[0].text.substring(16, 32));
+    return randomStanza[0].text;
+};
+let stanza = await getStanza();
+while (true) {
+    let outerInterval;
+    let innerInterval;
+    if (stanza) {
+        let characterLocation = 0;
+        outerInterval = setInterval(async () => {
+            lcd.printLineSync(0, "                ");
+            innerInterval = setTimeout(() => {
+                lcd.printLineSync(0, `${16 - characterLocation > 0
+                    ? Array(16 - characterLocation).join(" ")
+                    : ""}${stanza}`.substring(characterLocation, 16 + characterLocation));
+            }, 50);
+            characterLocation++;
+            if (characterLocation > stanza.length) {
+                stanza = await getStanza();
+                characterLocation = 0;
+            }
+        }, 700);
     }
-}, 3000);
+    await timer((16 + stanza.length) * 750);
+    clearInterval(outerInterval);
+    clearInterval(innerInterval);
+}

docs/readme.md

@@ -1,21 +1,26 @@
-# Internet radio electronics for Black Portal Detroit 
+# Internet radio electronics and software for Black Portal Detroit
+
 Electronics and software for the Black Portal Detroit work By Wes Taylor for the [Code Switch show at at MOCAD](https://thekitchen.org/on-view/code-switch-distributing-blackness-reprogramming-internet-art/). Electronics and software built and written by Boaz Sender based on Wes' concept and at Wes' direction.
 
 ## Software provisioning and setup
+
 This repository also contains documentation for how to buy and setup the electronics for Black Portal Detroit.
 
 1. Broadcaster bill of materials and software setup instructions in [broadcaster.md](broadcaster.md)
 2. Listener bill of materials and software setup instructions in [listener.md](listener.md)
 
 ## Custom software
+
 This repository contains custom software for turning a m3u radio stream into a logic for random selection of lyrics from an sqlite database of song stanzas written by Detroiters from the neighborhood where MOCAD is.
 
 3. Custom software development instructions in [listener-lcd-screen-software.md](listener-lcd-screen-software.md)
 
 ## Turning on the devices
+
 4. The sequence for turning on the system is in [how-to-turn-it-on.md](how-to-turn-it-on.md)
 
 Prior research that didn't work in `research-` md files.
 
 ## Live access
+
 5. If everything is turned on and configured properly, you may visit https://blackportaldetroit.com to hear the broadcaster.

package.json

@@ -5,7 +5,7 @@
   "description": "https://blackportaldetroit.com",
   "main": "index.js",
   "scripts": {
-    "build": "tsc screen.ts",
+    "build": "tsc",
     "deploy": "npm run build && rsync -avx rsync -a --exclude-from='exclude.txt' ./ grace@listener.local:portal"
   },
   "repository": {

screen.ts

@@ -1,31 +1,69 @@
-import { PrismaClient } from "@prisma/client";
+import { PrismaClient, Stanza } from "@prisma/client";
 const prisma = new PrismaClient();
-import LCD from "raspberrypi-liquid-crystal"
-const lcd = new LCD( 1, 0x27, 16, 2 );
+import LCD from "raspberrypi-liquid-crystal";
 
+const timer = (ms: number) => new Promise((res) => setTimeout(res, ms));
+
+const lcd = new LCD(1, 0x27, 16, 2);
+const tag = "                Black Portal 1234 E Davison, Detroit Michigan";
 lcd.beginSync();
 lcd.clearSync();
-lcd.printSync( 'Black' );
-lcd.setCursorSync(0, 1);
-lcd.printSync( 'Portal' );
 
+let tagCount = 0;
 
-setInterval(async ()=>{
+setInterval(() => {
+  lcd.printLineSync(1, "                ");
+  setTimeout(() => {
+    lcd.printLineSync(1, tag.substring(tagCount, 16 + tagCount));
+  }, 50);
+
+  tagCount++;
+
+  if (tagCount > tag.length) {
+    tagCount = 0;
+  }
+}, 500);
+
+const getStanza = async () => {
   const stanzaCount = await prisma.stanza.count();
-  const skip = Math.floor(Math.random() * stanzaCount) - 1;
+  const skip = Math.floor(Math.random() * stanzaCount);
 
   const randomStanza = await prisma.stanza.findMany({
-    take: 2,
     skip: skip,
+    take: 1,
   });
 
-  if(randomStanza){
-    lcd.clearSync();
-    if(randomStanza[0].text.length < 16){
-    lcd.printSync( randomStanza[0].text );
-    lcd.setCursorSync(0, 1);
-    lcd.printSync( randomStanza[1].text );
-  }
-  }
-}, 3000)
+  return randomStanza[0].text as string;
+};
 
+let stanza = await getStanza();
+
+while (true) {
+  let outerInterval;
+  let innerInterval;
+  if (stanza) {
+    let characterLocation = 0;
+    outerInterval = setInterval(async () => {
+      lcd.printLineSync(0, "                ");
+      innerInterval = setTimeout(() => {
+        lcd.printLineSync(
+          0,
+          `${
+            16 - characterLocation > 0
+              ? Array(16 - characterLocation).join(" ")
+              : ""
+          }${stanza}`.substring(characterLocation, 16 + characterLocation)
+        );
+      }, 50);
+      characterLocation++;
+
+      if (characterLocation > stanza.length) {
+        stanza = await getStanza();
+        characterLocation = 0;
+      }
+    }, 700);
+  }
+  await timer((16 + stanza.length) * 750);
+  clearInterval(outerInterval);
+  clearInterval(innerInterval);
+}

tsconfig.json

@@ -1,4 +1,8 @@
 {
+  "exclude": [
+    "node_modules",
+    "prisma"
+  ],
   "compilerOptions": {
     /* Visit https://aka.ms/tsconfig to read more about this file */