modded Lawnchair Launcher or how I build my C4 Carputer

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joerg
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modded Lawnchair Launcher or how I build my C4 Carputer

Post by joerg » Wed Jun 03, 2020 9:06 pm

Hello odroid community, I just want to show how is looking Lawnchair Launcher with a custom menu drawer on Lineage 17.
This menu I created years ago to use with the C2 in my car. Now I have polished the favorites part and integrated it into Lawnchair.
I don't like to much app starters on the home screen, better none of them. ;)
On the home screen there are three dots in left downer corner to open the menu.
Screenshot_20200603-134318_Lawnchair.png
Screenshot_20200603-134318_Lawnchair.png (1 MiB) Viewed 1231 times
A list of all apps...
Screenshot_20200603-134216_Lawnchair.png
Screenshot_20200603-134216_Lawnchair.png (624.04 KiB) Viewed 1231 times
Favorites...
Screenshot_20200603-135623_Lawnchair.png
Screenshot_20200603-135623_Lawnchair.png (827.19 KiB) Viewed 1231 times
Adding apps to favorites...
Screenshot_20200603-140104_Lawnchair.png
Screenshot_20200603-140104_Lawnchair.png (614.77 KiB) Viewed 1231 times
BTW. I am waiting the pcb for the car interface board to finalize this project (C4 Carputer). It's as of DHL on the way...
...but I don't know if it ever will be in my hands :twisted:

Code: Select all

2020-06-02 23:34:36 Uncontrollable Clearance Delay
2020-06-02 08:16:00 Uncontrollable Clearance Delay
2020-05-31 17:42:00 Uncontrollable Clearance Delay
2020-05-31 16:02:24 Processed for clearance at LEIPZIG-DEU
2020-05-31 15:27:06 Arrived at Sort Facility LEIPZIG-DEU
2020-05-30 06:43:58 Departed Facility in HONG KONG-HKG
2020-05-30 06:23:47 Processed at HONG KONG-HKG
2020-05-29 23:23:00 Uncontrollable Clearance Delay
2020-05-29 21:43:33 Processed for clearance at LEIPZIG-DEU
2020-05-29 19:09:08 Arrived at Sort Facility LEIPZIG-DEU
2020-05-29 17:13:38 Processed at HONG KONG-HKG
2020-05-29 11:54:59 Customs status updated
2020-05-29 11:15:14 Processed at DUBAI-ARE
2020-05-29 07:27:58 Departed Facility in HONG KONG-HKG
2020-05-28 23:26:43 Clearance processing complete at HONG KONG-HKG
2020-05-28 22:11:21 Arrived at Sort Facility HONG KONG-HKG
2020-05-28 18:58:00 Customs status updated
2020-05-28 18:06:58 Departed Facility in SHENZHEN-CHN
2020-05-28 18:05:53 Processed at SHENZHEN-CHN
2020-05-28 18:04:52 Arrived at Sort Facility SHENZHEN-CHN
2020-05-28 13:05:27 Customs status updated
2020-05-28 16:50:51 Shipment picked up 
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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by joerg » Wed Jun 10, 2020 11:56 pm

Finally the pcb (10 pcs.) has arrived. :)
IMG_20200610_160300.jpg
IMG_20200610_160300.jpg (926.71 KiB) Viewed 1155 times
IMG_20200610_160204.jpg
IMG_20200610_160204.jpg (879.8 KiB) Viewed 1155 times
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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by joerg » Thu Jun 11, 2020 2:46 am

I have designed my pcb for the Toslink/spdif footprint PLT133/T10W, but I find it very difficult to get them. There are only few distributors like Digi-Key with delivery at high costs. Also they don't have the PLT133 in stock, but the nearly identical EAPLTAA6, also from Everlight.
Now I found another device that has the same footprint: Cliff OTJ-8 FCR684208T. It has some less bit rate, as datasheet 12.5Mbps (PLT133: 16Mbps). There are more distributors for the OTJ8. I bought two in Germany at Conrad.

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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by rooted » Thu Jun 11, 2020 6:18 am

Your boards turned out really nice, I hope you got all the traces and components right so you won't need another revision :)
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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by joerg » Thu Jun 11, 2020 10:58 pm

Thank you, @rooted. I haven't tested all, but the mayor part.
Here is how it looks, not yet in the car. To assemble into the car, I need to make a housing first.
IMG_20200611_151313.jpg
IMG_20200611_151313.jpg (502.78 KiB) Viewed 1116 times
IMG_20200611_151635.jpg
IMG_20200611_151635.jpg (554.99 KiB) Viewed 1116 times
The switch is for simulating the ignition wire.
When the 12V connector is plugged in then the gpio of the ATiny that controls the power fet is for some milli seconds on and the fuse is opening due to the in rush current. This it makes two or three times and causes the ATiny to reboot. But not always. I think I will change the 3.15A super fast fuse to a slower one to avoid this. This is a minor issue, as the connection of the 12V not so often happens when it is assembled in the car.
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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by joerg » Fri Jun 12, 2020 1:27 am

Here I post again the shematic of the pcb.
C4 Car Interface.png
C4 Car Interface.png (89.36 KiB) Viewed 1103 times
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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by mad_ady » Fri Jun 12, 2020 1:41 am

It fits nicely, great job!
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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by odroid » Fri Jun 12, 2020 8:41 am

Looks great! :D
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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by Tenaja » Fri Jun 12, 2020 9:08 pm

Looks like a neat project
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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by joerg » Sat Jun 13, 2020 3:59 am

I have created another service app that regulates the pwm fan. It reads the temperatures of zone0 and zone1 and sets the duty cycle by calculation (temp - 25) * 15 * 1000. So it will be 75% at 75°C and 37.5% at 50°C. I need to polish it a little, means making this calculation be settable in prefences. I am using a refurbished 5V fan from notebook.
Screenshot_20200612-204842_Lawnchair.png
Screenshot_20200612-204842_Lawnchair.png (423.99 KiB) Viewed 1049 times
BTW, it would be great if setting pwm is possible by Android Things. But I assume it's not yet available?
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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by rooted » Sat Jun 13, 2020 4:37 am

That's awesome, you keep banging out those super useful apps that make using as a carputer so much nicer.

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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by joerg » Mon Jun 15, 2020 3:51 am

The app for controlling the pwm fan is ready:
TemperatureService-V1.1.0.apk.zip
(1.53 MiB) Downloaded 18 times
V1.1.0
-New preference and function 'Low limit temperature to switch off PWM'. The hysteresis is 5°C.
-Changed default frequency to 12kHz

I made it open source :) : https://github.com/joerg65/TemperatureService
It is limited to work only on C4 and N2. On N2 I haven't tried it yet.
The settings page is written in English, German and Spanish.
The image draws the linear function as the settings are applied. To show how the duty cycle relates to the temperature.
Screenshot_20200614-204548_Temperature_Service.png
Screenshot_20200614-204548_Temperature_Service.png (35.25 KiB) Viewed 985 times
Screenshot_20200614-204529_Temperature_Service.png
Screenshot_20200614-204529_Temperature_Service.png (29.6 KiB) Viewed 789 times
It's designed for only landscape screen. On other screen than VU7+ it might look not so fine.
Last edited by joerg on Thu Jun 18, 2020 11:32 pm, edited 2 times in total.
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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by joerg » Mon Jun 15, 2020 4:05 am

The next step is to make a housing for the C4, the interface board and a fan. As I don't own a 3d printer, it will be made by handwork.
I have reserved some of the pcb, but 3 of them I can give away, unsoldered...pls. contact me by pn, if there is demand.
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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by joerg » Tue Jun 16, 2020 3:11 am

Some more details for the pcb:
B.png
B.png (59.15 KiB) Viewed 930 times
F.png
F.png (68.86 KiB) Viewed 930 times
BOM:

Code: Select all

"Source:","C4 Car Interface.sch"
"Date:","Mo 15 Jun 2020 18:16:09 CEST"
"Tool:","Eeschema 5.1.6-c6e7f7d~86~ubuntu18.04.1"
"Component Count:","39"
"Ref","Value","Footprint"
"BT1","CR1220","user:BatteryHolder_SMTU1220-SMT"
"C1","100","Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder"
"C2","1u","Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder"
"C3","22","Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder"
"C4","22","Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder"
"D1"," 5.0SMDJ15CA","Diode_SMD:D_SMC_Handsoldering"
"D2","3V3","ZenerDiode_SMD:D_MiniMELF"
"D4","1N4148","Diode_SMD:D_MiniMELF"
"D5","BLUE","LED_SMD:LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder"
"F1","3.15","Fuse:Fuse_Littelfuse_372_D8.50mm"
"J1","3p male","Connector_Phoenix_MC:PhoenixContact_MC_1,5_3-G-3.81_1x03_P3.81mm_Horizontal"
"J2","02x20","Connector_PinSocket_2.54mm:PinSocket_2x20_P2.54mm_Vertical"
"J3","01x02","Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical"
"J4","01x02","TerminalBlock_4Ucon:TerminalBlock_4Ucon_1x02_P3.50mm_Vertical"
"J5","02x03","Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Horizontal"
"J6","2p male","Connector_Phoenix_MC:PhoenixContact_MC_1,5_2-G-3.81_1x02_P3.81mm_Horizontal"
"J7","01x07","Connector_PinSocket_2.54mm:PinSocket_1x07_P2.54mm_Vertical"
"L1","SRP1265A-470","user:L_Bourns_SRR1265_Handsolder"
"Q1","SI4447","Package_SO:SOIC-8_3.9x4.9mm_P1.27mm"
"Q2","BC847","Package_TO_SOT_SMD:SOT-23"
"Q3","FMMT618","Package_TO_SOT_SMD:SOT-23"
"R1","2k7","Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder"
"R2","1k","Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder"
"R3","3k3","Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder"
"R4","10k","Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder"
"R5","1k","Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder"
"R6","2k","Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder"
"R7","2k","Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder"
"R8","3k3","Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder"
"R9","3k3","Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder"
"R10","330","Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder"
"R11","100","Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder"
"R12","470","Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder"
"SW1","RND 210-00255","user:SW_PUSH_6mm_H8.5mm"
"U1","MCP1703A-3302","Package_TO_SOT_SMD:SOT-23"
"U2","ATtiny85-20SU","Package_SO:SOIJ-8_5.3x5.3mm_P1.27mm"
"U3","DS3231M","Package_SO:SOIC-16W_7.5x10.3mm_P1.27mm"
"U4","PLT133-T10W","user:Everlight_PLT133_T10W"
All capacitors are ceramic.
R8 and R9 are not really needed. I learned in other thread that C4 has already 1k pull up resistors.
Without yellow Led it won't work! The Led acts as a Zener Diode.
For the power supply of the C4 must be soldered a header at J3. https://wiki.odroid.com/odroid-c4/appli ... ower_input
Alternatively there is another connector J6 to connect the power, if there is no trust in the header connection. ;)
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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by joerg » Thu Jun 18, 2020 2:54 am

Nearly ready with the housing. But as I said, it's hand made from soft pvc plates, that can be cut by knife and glued with a vulcanizing glue.
Then I went with my car for a first test and it worked basically everything: Spdif music listening, Gps navigating, Hilink modem Internet. The pwm fan makes noises with 1000Hz, also with 500Hz. I reduced the frequency to 100Hz, now it's less noisy.
On the picture is seen that there is a gap between the 40p header and the connector. It is meant for the air flow. I have to make and put some supports that makes the air go through the air gap to pass the cooling element.

It's not a beauty!
IMG_20200617_103454.jpg
IMG_20200617_103454.jpg (365.94 KiB) Viewed 873 times
IMG_20200617_103821.jpg
IMG_20200617_103821.jpg (398.26 KiB) Viewed 873 times

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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by odroid » Thu Jun 18, 2020 8:18 am

It is beautiful :D
Making an air gap is a brilliant idea indeed. :o

BTW, it is worth to try 25~30Khz of PWM frequency to lower the fan motor noise probably.

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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by joerg » Thu Jun 18, 2020 3:47 pm

odroid wrote:
Thu Jun 18, 2020 8:18 am
It is beautiful :D
Making an air gap is a brilliant idea indeed. :o
Thank you for the flowers!
BTW, it is worth to try 25~30Khz of PWM frequency to lower the fan motor noise probably.
I will check this due to the maximum power dissipation of 625mW of the FMMT618.
I need to measure the current and the du/dt of the switch to have an idea of the thermal loss.

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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by joerg » Thu Jun 18, 2020 7:34 pm

Thank you @odroid, I tried different pwm frequencies. The power stage is not well designed for frequency > 20kHz. The switch off takes about 25us, the switch on 3.4us. I tried another freewheeling diode, a faster one as 1N4148, but the behavior is the same.
But I have also low noise at frequencies of 12 - 16kHz. The power loss with this kind of fan I use is about <200mW. The fan takes 250mA. The main power loss is at switch on and off. During constant switch on phase it's about 3mW and not need to be taken in account.
Because of the switch off ramp the signal is looking as triangle at higher frequencies than 20kHz.
I checked also with finger and with thermometer, no significant warming a the FMMT618.
I will stay with 12kHz. As this is a good compromise of switch characteristic and noise.
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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by mad_ady » Thu Jun 18, 2020 8:12 pm

Since it will be in a car - will noise matter?

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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by joerg » Thu Jun 18, 2020 8:25 pm

@mad_ady, yes the noise at 1kHz was ugly penetrate. And some times I am sitting in the car waiting, without motor on, than it comes to foreground.

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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by joerg » Fri Jun 19, 2020 3:01 am

Here is the hex file for the ATtiny85 on the pcb:
TinyC4.hex.zip
(1021 Bytes) Downloaded 5 times
To flash it I use this avrdude command from Eclipse UI:
/usr/bin/avrdude -pt85 -cavrisp2 -P/dev/ttyACM0 -u -Uflash:w:TinyC4.hex:a -Ulfuse:w:0x62:m -Uhfuse:w:0xdf:m -Uefuse:w:0xff:m

A small description of the code:
* With Ignition On the ATtiny wakes up. The Output pin Enable will be switched On and the Power-FET connects power to the C4.
* The Ignition is internally rooted to Shutdown pin PB4 that is connected to GPIO 24 of C4, and there the pin should be set up as Shutdown.
* When Ignition switches to Off then C4 should initiate a shutdown and finally after delay time the 5V will be off and the ATtiny will go to sleep.
* If the Reboot button is pressed short time, the ATtiny does nothing, the button is also connected to GPIO 27 of C4 and should cause a reboot.
* Pressing the button more than 2s will cause a power cycle to the C4.
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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by joerg » Thu Jun 25, 2020 1:35 am

I have installed and running it since a couple of days. It's running fine. :)
These days we have > 30°C in Germany and today and yesterday I was at customers and in the afternoon came back to my car that was all day in full sun. Today I made a check, switched off the pwm fan and also cars' climate control, only opened the windows. The temperature of the C4 went to 65°C, some of my services running, music player and navigation app. Then I switched on the pwm fan, the temperature went down to 38 - 40°C with duty cycle of ~33%.
It shows me that it may work if people don't want to use an extra fan in a car installation. But I will stay with it! For the lifetime of an electronic system it is better when temperature is controlled, not so much deviation.
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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by mad_ady » Thu Jun 25, 2020 2:51 am

I wonder how hot do built-in stereo/navigation system run? I doubt they have cooling fans, but they may be less powerful...

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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by Tenaja » Thu Jun 25, 2020 7:33 am

Very large, exposed heat sinks.

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Re: modded Lawnchair Launcher or how I build my C4 Carputer

Post by joerg » Mon Jul 06, 2020 3:07 am

I have soldered one board and I have programmed and tested it. If someone wants it, please pm me. There are more 3 empty boards, I can solder them too.
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Technicavolous (Mon Jul 06, 2020 11:42 am) • rooted (Mon Jul 06, 2020 12:52 pm)

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