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DHT11 Wiring
Log from GreenGuard: The Smart Plant Environment Monitor
In this image, we have outlined the setup for our temperature and humidity monitoring using the DHT11 sensor. The DHT11 is interfaced with the ESP8266 microcontroller, with the sensor’s data pin connected to the ESP8266's D1 pin. This allows the microcontroller...

Flashback : Prework
Log from TI-57 Programmable Calculator Hardware Retrofit
The more I read about the TI-57, the more I wanted to fix mine. Of course, these are easily found on a-large-well-known-online-auction-site for modest prices - typically $40 or less. Like most hobby projects, my goals were entirely devoid of practicality. ...

Flashback : Measurements
Log from TI-57 Programmable Calculator Hardware Retrofit
I carefully opened a TI-55 donor unit and inserted a 27ohm resistor in series with one of the digit cathodes. I captured the display sequence on my trusty LeCroy oscilloscope and dumped to the built-in thermal printer - TI-55 LED...

I didn't choose the MCU ... it chose me!
Log from TI-57 Programmable Calculator Hardware Retrofit
I like the STM32 ARM cortex MCU family. They are well documented, readily available, and cheap 'breakout boards' for them abound. The MCU retrofit must fit nicely in the space of a 28-pin 0.6" pitch DIP, so package size is key. The STM32F103 is...

Blue Pill Emulation
Log from TI-57 Programmable Calculator Hardware Retrofit
Another key part of ensuring that replacing the TI-57's TMC1500 "brain" is possible is to ensure that the MCU has enough throughput to emulate it. My initial assumption was that a 64MHz 32-bit ARM MCU should be more than up to the task of emulating a...

Driving the Display
Log from TI-57 Programmable Calculator Hardware Retrofit
The TI-57 has a multiplexed 12-digit common cathode LED display. The corresponding 8 segments of all 12 digits are connected together; sort of. It turns out that TI economized on IC package pins by ”doubling up” the decimal point segment...

Power Supply and Lid
Log from TI-57 Programmable Calculator Hardware Retrofit
Rcl57mcu wants a 3.5-5V supply. So, even if I could resurrect the dead BP-7 NiCd pack/lid, it won’t work for this upgrade. I will instead recycle the tried-and-true USB charged 3.7V LiPo supply that I’ve used for HP Classic, HP-28S, and TI-58/59 supply...

Diagrams
Log from Thurlby Thandar PSU repair

PSU #001, a PL320
Log from Thurlby Thandar PSU repair
Fault label: "Sparky".2024-03-01Opened case. Mains cable enters through grommet and is wired to the front-panel mains switch. There is no IEC filtered inlet.No sparking seen, even if wires poked with an insulated plastic rod (a Biro).Dials set to maximum,...

PSU #010, a PL320QMD
Log from Thurlby Thandar PSU repair
Fault label: "Numbers keep changing".2024-03-01Switched on, set dials to maximum. Leftt around 28.8V and drifiting, right around 32.88Dials set to minimum.Left side very slowly descends to 14.3 volts, terminals are at -0.424 volts.Right side slowly descends...

PSU #073, a PL154
Log from Thurlby Thandar PSU repair
Fault label: "Missing sense plate, wrong voltage". Suggested action: Check voltage entering digital meter chips.

PSU #075, a PL154
Log from Thurlby Thandar PSU repair
Fault label: "Current readout and limit vastly wrong". Suggested action: Check voltage entering digital meter chips.

PSU #077, a PL154
Log from Thurlby Thandar PSU repair
Fault label: "Faulty current limit". Suggested action: Check current sensing circuitry.

PSU #084, an EX1810R
Log from Thurlby Thandar PSU repair
This is a switch-mode PSU, so the mains is rectified to around 400 volts DC inside. Extra care is required to avoid touching this dangerous part of the PCB. Fault: Sparking at back of unit. Suspected cause: Faulty power connector or EMC capacitors. Examination:...

PSU #095, a CPX400SP
Log from Thurlby Thandar PSU repair
This is a switch-mode PSU, so the mains is rectified to around 400 volts DC inside. Extra care is required to avoid touching this dangerous part of the PCB. This can be remote controlled by GPIB, RS232, USB or Ethernet. The user manual is here: CPX400S+SA+SP_Instruction_Manual-Iss9.pdf...

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