Neighborhood waste collectors and shops can't see recyclable prices and lose income when they drop
A Bangkok collector said recycler payments mostly fall, sometimes by several baht at once, and they cannot just stop trading. Waste paper dropped from about 7 baht to under 2 baht per kilo in early 2019, and a recycler lost over a million baht. About 1.5 million people collect recyclables and sell to roughly 30,000 registered buyers, while some market vendors earn extra by selling sorted recyclables.
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5 ways to tackle it
Hardware and sensors
Scrap Price Board: an e-ink sign at the collection point with today's price per kilo
A small e-ink panel shows today's buying price for paper, plastic, glass and metal from nearby buyers, updated each morning. Collectors see the number before they load the truck and decide whether to sell or hold, without opening any app.
Build with ESP32, 7.5 inch e-ink, WiFi, price scraper or manual entry sheet
Hardware and sensors
Scale Slip: a hanging scale that weighs, prints a receipt and logs the sale
A cheap load-cell scale hung from a hook shows the weight, and a button chooses the material. It prints a slip with the kilos, the day's price and the amount, and keeps a log, so collectors have their own record to compare against the buyer's weighing.
Build with ESP32, HX711 load cell, thermal printer, buttons, Google Sheets
Voice and phone
Price Call Line: call a number, hear today's price for each kind of scrap
Collectors without smartphones call a free number and hear today's prices and the best nearby buyer read aloud in Thai, plus a trend line like 'paper fell 40 satang this week'. A sticker with the number goes on the collection cart.
Build with Twilio Voice, Thai TTS, price table, n8n updater
Camera and vision
Scrap Scan: photograph a pile, get a weight and value estimate
The collector photographs a pile of cardboard, bottles or cans. Vision estimates weight and value at today's price, so an owner can see whether it is worth the trip before hauling it.
Build with Claude vision, density table, price feed, mobile web
Automation and APIs
Pickup Match: shops and collectors agree on a time, once, and it repeats
Shops list what they have and when they have it, collectors list their route. The system matches them to a weekly pickup slot so the shop's sorted cardboard leaves on time and the collector's route is full.
Build with n8n, Google Sheets, Twilio SMS, simple route matcher
What people reported
Eco-Business (2019-2020): named collector Nathida Rerkyanyong says prices mostly fall; waste paper about 7 to under 2 baht per kg; recycler Thawat Krairak lost over 1 million baht; about 1.5 million collectors and 30,000 registered recycling businesses.
eco-business.comBMA release: Bang Khun Si Market vendors sell sorted recyclables for extra income; 10-15 kg of recyclables recovered per day.
pr-bangkok.com