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This is the Graupner HoTT adapted version of the Model Locator script. It uses the Graupner HoTT telemetry sensor "Rssi" instead of the OpenTX sensor "RSSI". (#693)
Reasoning: The OpenTX sensor "RSSI" is populated by the individual OpenTX telemetry protocol implementations and returns a value from 0..100 (percent) originating from the early FrSky implementation. It turns out that FrSky did not really provide a genuine signal strength indicator in units of dbm but a link quality indicator in 0..100%. With Graupner HoTT the link quality indicator is not a good basis for the model locator as it is very non-linear and doesn't change much with distance. Using the Graupner HoTT telemetry sensor "Rssi" which is a true signal strength indicator serves the purpose of locating a model much better as it varies much more with distance.
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Lua_scripts/Graupner HoTT Model Locator.lua
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Lua_scripts/Graupner HoTT Model Locator.lua
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---- #########################################################################
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---- # #
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---- # Telemetry Widget script for FrSky Horus/Radio Master TX16s #
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---- # Copyright (C) EdgeTX #
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-----# #
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---- # License GPLv2: http://www.gnu.org/licenses/gpl-2.0.html #
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---- # #
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---- # This program is free software; you can redistribute it and/or modify #
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---- # it under the terms of the GNU General Public License version 2 as #
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---- # published by the Free Software Foundation. #
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---- # #
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---- # This program is distributed in the hope that it will be useful #
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---- # but WITHOUT ANY WARRANTY; without even the implied warranty of #
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---- # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
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---- # GNU General Public License for more details. #
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---- # #
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---- #########################################################################
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-- Model Locator by RSSI
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-- Offer Shmuely (based on code from Scott Bauer 6/21/2015)
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-- Date: 2021
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-- ver: 0.1
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-- MHA (based on code from Offer Shmuely)
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-- Date: 2022
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-- ver: 0.11
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-- changes: made version for Graupner HoTT. Uses real Rssi data scaled -15db to -115db to 100..0
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-- This widget help to find a lost/crashed model based on the RSSI (if still available)
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-- The widget produce audio representation (variometer style) of the RSSI from the lost model
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-- The widget also display the RSSI in a visible colorized bar (0-100%)
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-- There are two way to use it
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-- 1. The simple way:
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-- walk toward the quad/plane that crashed,
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-- as you get closer to your model the beeps will become more frequent with higher pitch (and a visual bar graph as well)
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-- until you get close enough to find it visually
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-- 2. the more accurate way:
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-- turn the antenna straight away (i.e. to point from you, straight away)
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-- try to find the weakest signal! (not the highest), i.e. the lowest RSSI you can find, this is the direction to the model.
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-- now walk to the side (not toward the model), find again the weakest signal, this is also the direction to your model
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-- triangulate the two lines, and it will be :-)
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local delayMillis = 100
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local nextPlayTime = getTime()
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local img = Bitmap.open("/SCRIPTS/TOOLS/Model Locator (by RSSI).png")
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--------------------------------------------------------------
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local function log(s)
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--return;
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print("locator: " .. s)
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end
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--------------------------------------------------------------
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-- init_func is called once when model is loaded
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local function init()
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return 0
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end
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-- bg_func is called periodically when screen is not visible
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local function bg()
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return 0
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end
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-- This function returns green at gvalue, red at rvalue and graduate in between
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local function getRangeColor(value, red_value, green_value)
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local range = math.abs(green_value - red_value)
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if range == 0 then
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return lcd.RGB(0, 0xdf, 0)
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end
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if value == nil then
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return lcd.RGB(0, 0xdf, 0)
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end
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if green_value > red_value then
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if value > green_value then
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return lcd.RGB(0, 0xdf, 0)
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end
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if value < red_value then
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return lcd.RGB(0xdf, 0, 0)
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end
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g = math.floor(0xdf * (value - red_value) / range)
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r = 0xdf - g
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return lcd.RGB(r, g, 0)
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else
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if value > green_value then
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return lcd.RGB(0, 0xdf, 0)
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end
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if value < red_value then
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return lcd.RGB(0xdf, 0, 0)
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end
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r = math.floor(0xdf * (value - green_value) / range)
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g = 0xdf - r
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return lcd.RGB(r, g, 0)
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end
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end
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local function main(event)
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lcd.clear()
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-- fetch uplink rssi (HoTT sensor Rssi)
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local rssi = getValue("Rssi")
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-- calculate a percentage for the color bar (range -115db to -15db)
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local rssiP = rssi
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if(rssi ~= 0) then -- rssi < 0 -> telemtry data received
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if(rssi >= -15) then -- -15db to -1db => 100%
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rssiP = 100
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else
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if(rssi >= -115) then -- between -115db and -15db => 0% to 100%
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rssiP = 100+rssi+15
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else
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rssiP = 0 -- less than -115 => 0%
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end
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end
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end
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lcd.drawBitmap(img, 250, 50, 40)
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-- Title
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lcd.drawText(3, 3, "Graupner HoTT Rssi Model Locator", 0)
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myColor = getRangeColor(rssi, 0, 100)
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lcd.setColor(CUSTOM_COLOR, myColor)
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-- draw current value
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local dx = 0
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if rssi < -99 then
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dx = -33
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end
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if rssi == 0 then
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lcd.drawText(115, 73, "no telemetry", DBLSIZE + CUSTOM_COLOR)
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else
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lcd.drawNumber(180+dx, 30, rssi, XXLSIZE + CUSTOM_COLOR)
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lcd.drawText(275, 73, "db", 0 + CUSTOM_COLOR)
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end
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-- draw main bar
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lcd.setColor(CUSTOM_COLOR, YELLOW) -- RED / YELLOW
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local xMin = 0
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local yMin = 270
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local xMax = 480
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local yMax = 200
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local h = 0
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local rssiAsX = (rssiP * xMax) / 100
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for xx = xMin, rssiAsX, 20 do
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lcd.setColor(CUSTOM_COLOR, getRangeColor(xx, xMin, xMax - 40))
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h = h + 10
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lcd.drawFilledRectangle(xx, yMin - h, 15, h, CUSTOM_COLOR)
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end
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-- beep
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if getTime() >= nextPlayTime then
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playFile("/SCRIPTS/TOOLS/Model Locator (by RSSI).wav")
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nextPlayTime = getTime() + delayMillis - rssiP
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end
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return 0
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end
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return {init = init,run = main,background = bg}
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