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Whenever I end up with a new agent I ultimately end up afraid in a new GPS/Receiver aggregate for bigger complete affection and a bigger GPS.

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I am absolutely at home disturbing into a dashboard as I was accountant to install CB radios in my adolescence as able-bodied as actuality the bounded go-to guy for 8-track stereo upgrades in the 70’s. I accept spent a allocation of my activity laying upside bottomward in a dabble on the car attic analytical up into the blend of affairs and brackets aggravating to accumulate things from bottomward on my face. If you bethink my column on my Datsun 280ZXT, I laid in that aforementioned position while acclimation in a clamp pedal bracket while accepting actual little acclimation charcoal on my face. I did accomplish a agenda that the aing time I catechumen a car from an automated to a chiral to do so while things are still disassembled.

Swapping out a branch radio usually involves allotment whether to drudge into the absolute branch base wire-by-wire, or my preference, accepting a cable accouter that mates with the branch bung and authoritative an adapter out of it by splicing it to the adapter that comes with the new radio.

Usually I still accept to coursing bottomward a few signals such as about-face indicator, parking anchor indicator, agent acceleration sensor and the like. In my aftermost agent the Agent Acceleration Sensor (VSS) wire was declared to be in the branch harness, but active acquaintance showed it charge not be as the GPS would appearance me active 30 anxiety to the appropriate of the highway. That and the arrangement awning on the GPS absolute that it was not accepting acceleration pulses.

Diving abysmal into the birr absolute that a distinct wire was in actuality missing in animosity of actuality apparent in the accepted Haynes manual. Many times the VSS arresting is on the accouter for use by a GPS or for the automated aggregate acclimation on the radio — as the agent goes faster the branch radio gets louder.

I arrested all of my online installer assets and no one had articular the arresting as present anywhere in the disciplinarian compartment. Finally I busy the Ford schematics anon from Ford and was able to analyze a safe acceleration arresting to use. I should agenda that I breach abroad from the caster acceleration sensors for the anti-lock anchor system, I am already cool out by the anticipation that a microcontroller is active the brakes on my behalf. As it turns out there was a aloof arresting that lets the windshield wiper ambassador acceleration up back the vehicle speeds up, like an automated aggregate ascendancy alone for wipers.

All of this accomplishment got me cerebration about how abroad I could accept done this after active affairs through the firewall and borer one of 300 affairs absorbed to the on-board Electronic Ascendancy Unit (ECU). In added words, how would a accustomed actuality do it?

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One anticipation I had was to put calm a committed ambit that could query what the agent acceleration was from the congenital On Lath Diagnostic bus (OBD or OBDII) and synthesizing a acceleration beating from the consistent data. Looking on the Internet briefly I begin that there was one aggregation that did this for retrofitting taxicabs for the metering accouterments but not abundant added than that. Besides all of that, I bare a affair for a Hackaday video.

Here we see the years that the assorted OBD protocols were acclimated and a quick summary.

Name

Speed

Used by

ISO 9141

10 Kbits/second

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most Asian and European manufacturers

J1850 PWM

(Pulse Width Modulation)

100 Kbits/second

Ford, Mazda

J1850 VPW

(Variable Beating Width)

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100 Kbits/second

Primarily GM

CAN

(Controller Area Network)

200-500

Kbits/second

Newer Vehicles

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Looking into the OBDII adapter and agreement the aboriginal affair that all-overs out is that it’s not a distinct protocol; it is a accumulating of bequest protocols. Vehicles fabricated back 2008 about use the Ambassador Area Network (CAN) protocol.

One affair I knew was that I didn’t appetite to apprentice the intricacies of these lower akin protocols and how to affairs at a bit or anatomy level, I aloof capital to ask and get an acknowledgment to a simple question: “What is the agent speed?” In the video I do go into the altered electrical interfaces for J1850, ISO9141 and CAN.

I came aloft an OBD analyst dent fabricated by OBD Solutions. It’s alleged the STN1110 and converts the concrete and low akin protocols into a simple ASCII based UART interface.

Sending a concern for the Parameter Identification (PID) for Agent acceleration “010d” after-effects in a three byte acknowledgment with the third byte actuality the agent acceleration in kilometers and hour as a distinct byte hex value. (0-255 km/hr). From this abstracts it’s aloof a amount of creating a beating that gets faster based on the admeasurement of the VSS value, the beyond the value, the college the achievement frequency. I absolutely don’t apperceive what the GPS expects as a accustomed abundance but actuality software, I can consistently calibration it if I run into problems.

Looking at the datasheet for the STN1110 they accord examples of the interface chip for the assorted protocols: CAN, J1850, ISO9141. If I were accomplishing this activity for accumulation I would analyze the interfaces in abundant detail, but for a video and a one-off ambit I am added than accommodating to booty the vendor’s appropriate circuits as they best acceptable apperceive the “normal” for what works.

What the artist still has to do is accomplish abiding that billow aegis and that the accepted draw and the adeptness to “sleep” are advised in. With attention to billow suppression, the auto is one bedraggled environment; huge inductors (starter, alternator) and lots of places area spikes and surges can be injected. With attention to accepted draw, the accumulation would be acquainted in “permanently” which agency that it’s accepted draw charge be atomic while sitting for weeks on array power. I already installed an anxiety arrangement in one of my cars which dead the array in a week, it sucked.

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Looking at the lath you will see I did an batty thing, I alloyed apparent arise and through-hole and not aloof any through-hole, I army the resistors radially, acceptation that they angle up like the old Japanese radios of the 70s-80s. Part of the abstraction was what if I capital to accomplish a kit and the added is that I absolutely abhorrence agreement 50 SMT resistors as they get in my arm beard and it’s accessible to confuse them. The admeasurement of the PCB was called to fit a artificial asylum I best off of Digikey.

Turns out already I got into aggregate I apprehend that if I carve the architecture bottomward to aloof the CAN agreement (2008 ) it will do aggregate I charge and so rev 2 will be all through-hole so I can bandy the spares up on Tinde as a kit.

Things assignment able-bodied abundant with the final lath with the barring of the actuality that I absent that one of the LED indicator pins is additionally acclimated to admit a Non-Volatile RAM initialization… I beggarly who doubles an LED pin as an ascribe pin? Even with the LED in abode a resistor would be bare to tie it to a accepted accompaniment back an LED that is angry off doesn’t conduct accepted or act like a resistor.

Finally at the end of the video I breach out my bargain OBD actor which basically parks my barter on the assignment bench, electronically speaking. There are absolutely acceptable versions of these, abundance is a $70 one I got off eBay. The instructions are in Mandarin but they absolutely aren’t needed. Using a dev lath with congenital USB adapter simulates my custom lath after the FTDI alternation I was accepting amid the Hackaday Pro Trinket and consecutive monitor. I set the baud for 9600 and affair the PID concern for VSS: 010D (or $010D as I would say actuality an old timer)

It replies with B5 acceptation that the actor is traveling at 181 km/hr. (Decimal of Hex B5 is 181)

In the aing column I abode the software. Actuality a simple anatomy of chart my affection is to apparatus this as a (simple) Real Time Operating Arrangement (RTOS) acceptation that accouterments counters and timers angry to clear actualize the final arresting that does not alter based on the beheading time of the code. I am additionally absorbed to use assembler (did you abide to the Hackaday 1k Challenge??) and because I am a accouterments architect I adulation accurate In ambit Emulators(ICE). You know, area you absolutely see the beheading of the processor itself and can set accurate breakpoints (An IDE is not an ICE). See you aing time!

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