BMP180 Temperature (and consequently Pressure) Error ( > about 40 °C ) · rwaldron/johnny-five#1696

(2 comments) (0 reactions) (0 assignees)JavaScript (13,152 stars) (1,845 forks)batch import

BugClass:BarometerGood First IssueHardware Required

説明

The uncompensated temperature of the BMP180 is incorrectly converted to a 16-bit signed value, instead of a 32-bit signed value (long). Since the data is 16-bits wide and can therefore not be negative, the easy fix would be to do the following:

sip.js(1128): uncompensated = uint16(data[0], data[1]);

Please see page 15 of the manual of the BMP180 chip: https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BMP180-DS000.pdf

コントリビューターガイド

技術スタック: javascriptnodejs
領域: backend
Issue 種別: bug
難度: 2
推定時間: under 1 hour
活動状況: stale
明確さ: clear
前提条件: JavaScript
初心者向け度: 90
調査方針: The issue identifies a bug in the BMP180 driver where uncompensated temperature is incorrectly converted to a 16 bit signed value instead of a 32 bit signed value. The suggested fix is to modify line 1128 of sip.js to use uint16() to read the raw data, then cast to a signed 32 bit integer. Review the BMP180 datasheet section on temperature measurement to confirm the correct data type. After making the change, test with temperatures above 40°C to ensure pressure readings are also corrected.