@rdotapps profile picture
Rishik @rdotapps

building the cursor for hardware

Joined January 2025
  • Tweets 2,031
  • Following 309
  • Followers 492
34 Photos and videos
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Rishik
@rdotapps
Apr 11
introducing protoflow the fastest way to make a circuit in 2026
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the hardest part of hardware is that every abstraction eventually becomes a physical budget. current, heat, latency, tolerance, noise, space, weight, cost, yield. software lets you ignore the world for a while. hardware sends the invoice.
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Rishik
@rdotapps
Jun 13
Arduino made embedded feel possible. ESP32 made wireless feel normal. What board do you reach for first when you want an idea working tonight?
Close-up studio photo of a black ESP32 development board with header pins, a metal RF shield over the module, a micro-USB connector, and two pushbuttons on a white background.

ALT Close-up studio photo of a black ESP32 development board with header pins, a metal RF shield over the module, a micro-USB connector, and two pushbuttons on a white background.

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Nothing trains you faster than chasing continuity across a board with probes in both hands. What is the first thing you check when a circuit refuses to behave?
Close-up photo of red and black multimeter probes touching jumper wires plugged into a solderless breadboard, showing a hands-on continuity or voltage check during circuit debugging.

ALT Close-up photo of red and black multimeter probes touching jumper wires plugged into a solderless breadboard, showing a hands-on continuity or voltage check during circuit debugging.

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physical products are not software with a case around them. they are code, circuits, power, mechanics, materials, manufacturing, thermal paths, connectors, and failure modes sharing one budget. the hard part is not one layer. it is making the layers tell the same truth.
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Robotics is where abstractions get audited. code has to survive motors, sensors, latency, noise, power limits, heat, bad connectors, calibration drift, and manufacturing tolerances. the interesting part is not the robot. it is every system arguing inside it.
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Oscilloscopes make invisible problems visible. The first time you catch a real signal moving, debugging feels completely different. What was the first signal you remember seeing on one?
Photo of a bench oscilloscope angled from the front-left, with a green waveform trace visible on the screen and control knobs across the front panel.

ALT Photo of a bench oscilloscope angled from the front-left, with a green waveform trace visible on the screen and control knobs across the front panel.
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Perfboard always starts as the quick temporary version and somehow ends up running for years. Do you still build one-off tools on perfboard, or send a PCB right away?
Photo of a handmade ATmega8 development board built on tan perfboard, with a DIP microcontroller, discrete components, jumper wires, and a green character LCD mounted above it.

ALT Photo of a handmade ATmega8 development board built on tan perfboard, with a DIP microcontroller, discrete components, jumper wires, and a green character LCD mounted above it.

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the schematic is the plan. the board is the negotiation. copper width, return paths, connector placement, heat, tolerances, assembly, cables, and noise all get a vote. hardware teaches you that implementation details are not details.
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That little metal crystal looks passive right up until two load caps decide whether the whole board boots. What clock or crystal lesson did you learn the hard way?
Photo of several quartz crystal resonators in different metal packages arranged on a white background, showing cylindrical and rectangular can styles with wire leads.

ALT Photo of several quartz crystal resonators in different metal packages arranged on a white background, showing cylindrical and rectangular can styles with wire leads.
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hardware is not a feature category. it is the place where software has to negotiate with power, heat, sensors, tolerances, latency, fixtures, supply chains, and humans. the best builders learn to think in systems before they think in screens.
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The next great products will not come from software alone. They will come from people who understand code, circuits, motors, sensors, materials, manufacturing, and failure modes. The future is physical systems.
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The future belongs to engineers who can debug across boundaries.
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Is Codex broken rn?? @thsottiaux @sama
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Most decoupling capacitors look boring right up until one sits a little too far from the IC and the board starts acting haunted. What decoupling lesson did you learn the hard way?
Close-up photo of several brown multilayer ceramic capacitors soldered onto a green printed circuit board, with nearby resistor and reference labels visible.

ALT Close-up photo of several brown multilayer ceramic capacitors soldered onto a green printed circuit board, with nearby resistor and reference labels visible.

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software lets you hide complexity behind an interface. hardware eventually makes you pay it back. current limits, heat, tolerances, EMI, battery sag, connector wear, and manufacturing variation all become part of the product. abstractions are useful. constraints ship.
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A diode looks simple right up until the stripe faces the wrong way and the board acts dead. What was your first diode mistake?
Close-up photo of a small black silicon diode with a visible black cathode band on the left side and exposed internal silicon between the leads.

ALT Close-up photo of a small black silicon diode with a visible black cathode band on the left side and exposed internal silicon between the leads.
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robotics is not a software problem. it is firmware, power, sensors, controls, mechanics, latency, noise, heat, tolerances, and manufacturing all disagreeing in one machine. the code matters. the physics gets a vote.
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Rishik
@rdotapps
May 29
The humble pull-up resistor probably saved more beginner projects than any fancy IC. What component did you underestimate at first?
Six through-hole resistors of different values lined up on a white background, with distinct color bands visible on each body.

ALT Six through-hole resistors of different values lined up on a white background, with distinct color bands visible on each body.

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Rishik
@rdotapps
May 29
A 0.1 uF capacitor looks almost too small to matter until a chip starts pulling current in sharp little bursts. Put it close to the power pin and the board gets calmer. What tiny layout habit saved you later?
Clean educational diagram showing an IC power pin with a 0.1 uF decoupling capacitor placed very close between VCC and ground, with short current-loop arrows and labels for VCC rail and GND plane.

ALT Clean educational diagram showing an IC power pin with a 0.1 uF decoupling capacitor placed very close between VCC and ground, with short current-loop arrows and labels for VCC rail and GND plane.
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Rishik
@rdotapps
May 28
A new board usually tells the truth through the current readout before anything else. Current limit has saved a lot of first power-ups. Do you bring up fresh boards on a bench supply first, or go straight to USB?
Close-up photo of a simple black bench power supply sitting on a desk, with red and black binding posts, a small power switch, and blurred lab equipment in the background.

ALT Close-up photo of a simple black bench power supply sitting on a desk, with red and black binding posts, a small power switch, and blurred lab equipment in the background.

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